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**1st Shift 9th Dec number series-****Number Series Questions asked in Slot 1 **

1) 346, 345, 337, 310, 246 **Ans : 121**

2) 159, 79, 39, 19, ?, 4 **Ans : 9**

3) 7.5, 9, 13.5, 27, 67.5 **Ans : 189**

4) 4, 2.5, 3.5, 9, 40 **Ans : 328**

5) 4.5, 3.5, 6, 17, 67 **Ans : 334**

Explanation of Number Series Questions asked in IBPS CLERK PRELIMS EXAM – 9th December 2017- Slot 1

**1. 346,345,337,310,246, ?**

346 – 13 = 345

345 – 23 = 337

337 – 33 = 310

310 – 43 = 246

246 – 53 = 121

**2. 159, 79, 39, 19, ?, 4**

159 – 80 = 79

79 – 40 = 39

39 – 20 = 19

19 – 10 = 9

9 – 5 = 4

**3. 7.5, 9, 13.5, 27, 67.5, ?**

7.5 + 1.5 = 9

9 + 4.5 = 13.5

13.5 + 13.5 = 27

27 + 40.5 = 67.5

67.5 + 121.5 = 189

(1.5 × 3 = 4.5, 4.5 × 3 = 13.5, 13.5 × 3 = 40.5, 40.5 × 3 = 121.5)

**4, 2.5, 3.5, 9, 40, ?**

4 × 0.5 + 0.5 = 2.5

2.5 × 1 + 1 = 3.5

3.5 × 2 + 2 = 9

9 × 4 + 4 = 40

40 × 8 + 8 = 328

**5. 4.5,3.5,6,17,67, ?**

4.5 × 1 – 1 = 3.5

3.5 × 2 – 1 = 6

6 × 3 – 1 = 17

17 × 4 – 1 = 67

67 × 5 – 1 = 334

**Memory Based Questions Asked in IBPS Clerk Prelims Previous Shifts 2017**

**Seating Arragements:**

**1).** 8 person seating in row some facing north and some facing south. The left of R, only 3 persons are there, three person between R and Q, more than 2 person between B and S, D is second left of S. person side of R facing south, person side of p face in same direction. C is second right of A. A and P in opposite direction, B and Q face in opposite direction.

**2).** 8 People S,T,U,V,W,X,Y,Z facing centre S sits 3rd to right of u Same number of people between S and Z and S and X V sits 3rd left of Z and 3 people sit between W and V Y is not neighbour of W.

**3). **Twelve friends are sitting in a parallel row facing each other containing Six people in each row. P,Q,R,S,T,U are sitting in Row 1 facing south, While A,B,C,D,E,F are sitting in Row 2 facing North not necessarily in the same order. Q sits second to the right of R, Where R does not sits in the extreme end of the lines. U sits to the immediate Right of Q.B sits second from the left end of the line. There are only two people between A and B. P sits second to the left of U. One who faces P is an immediate Neighbour of A.

**Puzzles-1:**

- 8 members – X,Y,Z,S.W,T,U,V
- X – Odd no floor , Except 3
- Z lives immediately below of X
- More than 2 members lives between Z and Y
- As per the number of persons lives above Y is same as number of persons lives below S.
- W lives one of the floor above U but one of the floor below V

**Puzzles-2:**

There are seven friends namely A,B,C,D,E,F,G attending lectures from Monday to Sunday not necessarily in the same order. C attends the lecture after Friday. There are only three people between C and B. D attends the Lecture after C. Number of People between C and D is same as number of People Between A and B, Where A attends the lecture prior to B.E attends the function on Wednesday. Number of person between E and F is same as E and A.

**Application Sums:**

**1).** Ratio of speed of boat down stream and speed of stream is 9:1, speed of current is 3 km per hr, find distance travelled upstream in 5 hours.

**2).** Sum of 4 consecutive even nos are greater than three consecutive odd nos by 81. If sum of lost odd and even number is 59, then find the sum of largest odd and even number.

**3).** Sum of Money invested in two schemes, in scheme A, X principle with 8 % per annum and in scheme B with X+1400 principle for two years and difference is 189, then find value of X?

**4).** Average age of A and B, 2 years ago was 26. If age of A 5 years hence is 40 yrs, and B is 5 year younger to C, then find difference between age of A and C?

**5).** Average of X, Y, Z is 24, X:Y = 2:3, X+Y = 60, then find X-Y=?

**6).** Cost price of two articles is same, trade man got profit of 40% on first article, selling price of second article is 25% less than first article, then find over all profit percent.

**7).** Length of rectangle is 80% of diagonal of square of area 1225, then find area of rectangle if it’s perimeter is 94√2.

**8).** Annual salary of Arun is 7.68 lac. If he spends 12000 on his childrens, 1/13th of rest in food, 8000 in mutual funds, then find the monthly saving he is left with.

**9).** A can do a work in 24 days, B is 20% more efficient than A, if C can do the work in 10 more days than B, find days taken by A and C together to complete the work.

**10).** The ratio of Milk to water is 5:4, if two litres of water is added, ratio becomes 10:9, then find new amount of water in the mixture.

**11).** Two items A and B cost price equal, item A sold at 40% profit and item B sold at 20%less than the selling price of item A, total profit is 189.find the cost price of A?

**12).** Two years hence the average age of A & B is 37. Three years ago the age of B is 36. If C is 11 years older than A then, find the sum of present ages of A & C?

**13).** A &B invest Rs. 116000 &144000 respectively. B invests for 6 months . At the end of the year B’s share 9000 find the overall profit?**14).** Length & speed of the train A is 170m &20m/s. Length of the train B is 180m both running at opposite direction & time taken by the trains to cross each other is 10sec.

Find speed B’s speed.

**15).** The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is:

**16).** A person’s present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present?

**17).** A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?

**18).** A sum of Rs. 725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of Rs. 362.50 more is lent but at the rate twice the former. At the end of the year, Rs. 33.50 is earned as interest from both the loans. What was the original rate of interest?

**19).** The salaries A, B, C are in the ratio 2 : 3 : 5. If the increments of 15%, 10% and 20% are allowed respectively in their salaries, then what will be new ratio of their salaries?

**20).** A is 10 km to the north of B. C is 5 Kms to the east of B. D is 2.5 Km to the north of C. E is north-west of point C & west of point D. Find the distance between point E & A.

**21).** A can do a work in 36 days & B is 20% more efficient than A, If A started working and worked for 8 daysand left then in how many days will B do the remaining work?

**22).** A invest 9600 and B invests X Rs. B leaves after 6 months. Total profit earned is 4600. A’s share is 3400. Find how much did B invest.

**23).** A vessel contains mixture of milk and water in the ratio 6:1. 7 litres of mixture is taken out and replaced with 3 litres of water. The content of water is now 14.5% of the total mixture. Find the original content of water.

**24).** A can do a work in 24 days. He worked alone for 15 days and then B joined and they finished the work in 5 days. In how many days can B alone do the work.

**Number Series:**

**1). 524, 479, 439, 404, 374, ?**

Logic: Difference of: 45, 40, 35, 30, 25

Answer: 349

**2). 4096, 256, 32, 8, ?, 4**

Logic: ÷16, ÷8, ÷4, ÷2,

Answer: 4

**3). 3, 2, 3, 6, ?, 37.5**

Logic: **×0.5+0.5, ×1+1, ×1.5+1.5, ×2+2, ×2.5+2.5**

Answer: 14

**4). 72, 71, 75, 66, 82, ?**

Logic: Difference of: 1, 4, 9, 16, 25

Answer: 57

**5). 0.5, 3, 12, 52, ?, 1596**

Logic: ×2+2, ×3+3, ×4+4, ×5+5

Answer: 265

**6). 3.5, 6, 10, 17, 30, ?**

Logic: ×2-1, ×2-2, ×2-3, ×2-4, ×2-5

Answer: 55

**7). 129, 127, 122, 112, ?**

Logic: Difference are -2,-5,-10 so Difference of difference be +3, +5, +7

Answer: 95

**8). 2, 8, 26, 80, 242, ?**

Logic: ×3+2, ×3+2, ×3+2, ×3+2, ×3+2

Answer:728

**9). 0.25, 8, 128, 1024, ?**

Logic:×32, ×16, ×8, ×4

Answer: 4096

**10). 60, 89, 112, 131, ?, 161**

Logic: Difference are 29, 23, 19 so Difference of difference will be 6, 4, 2, 0

Answer: 148

**11). 139, 130, 119, 106, 91, ?**

Logic: Difference are like -9, -11, -13, -15, -17

Answer: 74

**12). 4, 5, 7, 11, 19, ?**

Logic: Difference are like +1, +2, +4, +8, +16

Answer: 35

**13). 1536, ?, 768, 192, 24, 1.5**

Logic: ÷1, ÷2, ÷4, ÷8, ÷16

Answer: 1536

**14). 0.5, 2, 6, 15, 34, ?**

Logic: Difference are 1.5, 4, 9, 19

so Difference should be

1.5×2+1=4

4×2+1=9

9×2+1=19

19×2+1=39

Answer: 34+39=73

**15). 194, 194, 191, 183, 168, ?**

Logic: Difference are 0, 3, 8, 15 so Difference of difference will be 3,5,7,9

Answer: 144

**16). 84, 85, 89, 98, 114, ?**

Logic: +1^{2}, +2^{2}, +3^{2}, +4^{2}, +5^{2}

Answer:139

**17). 195 , 220 , 200 , 215 , 205 , ?**

Logic: +25, -20, +15, -10, +5

Answer: 210

**18). 2 , 16 , 64 , 128 ,128, ?**

Logic: ×8, ×4, ×2, ×1, ×0.5

Answer: 64

**19). 15 , 6.5 , 5 , 5.5 , ? , 18.25**

Logic: ×0.5-1, ×1-1.5, ×1.5-2, ×2-2.5, ×2.5-3

Answer: 8.5

**20). 10 , 12 , 17 , 27 , ? , 70**

Logic: Difference are 2, 5, 10 so Difference of difference will be 3,5,7,9

Answer: 44

**21). 2, 3, 6, 15, 45 ?**

Logic: ×1.5, ×2, ×2.5, ×3, ×3.5

Answer: 157.5

**22). 8, 4, 4, 6, 12, ?**

Logic: Difference ×0.5, ×1,×1.5, ×2, ×2.5**Answer: 30**

**23). 310, 220, 148, 92, 50, 20, ?**

Logic: Difference of Difference: 18, 16, 14, 12, 10

Answer: 0

**24). 221, ?, 165, 140, 117, 96**

Logic: Difference: 29, 27, 25, 23, 21

Answer: 192

**25). 5, 3.5, 5, ?, 21.25, 56.75**

Logic: ×0.5 +1, ×1 +1.5, ×1.5 +2, ×2 +2.5, ×2.5 +3

Answer: 9.5

**Simplification:**

1. ?÷60-3/4= 3 1/3

2. ?% of (152÷19×45)=126

3. 46% of 600+ 44% of 225=?

4. 12×9÷?×15= 16+38

5. ?÷12×4/0.6=250

6. ?+0.4= (1.6+5.4)÷2.5

**Reading Comprehension Passage Asked in IBPS Clerk Prelims 2017 – 1st Slot (2nd Dec)**

When Hurricane Harvey loomed off the coast of my home state of Texas, it seemed to fill the entire Gulf of Mexico. When it roared on land, it pummeled the towns of Rockport and Port Aransas, whose tawny beaches I’ve walked with my kids, pointing out the indigo sails of Portuguese man o’ war jellyfish. Harvey’s eye took direct aim at the University of Texas’ Marine Science Institute, flattening not just the facility itself, but priceless samples awaiting analysis.

After Harvey left Port Aransas, it spun back into the Gulf of Mexico over record sea temperatures as great as 4 degrees Fahrenheit above normal. Thermodynamic laws require that warmer air holds more water vapor. The heat armed the storm with a mighty arsenal of water vapor.

Then Harvey returned to land, dumping a catastrophic amount of rain on Houston. My Facebook feed filled with pleas for rescue from the rising waters. Friends’ houses flooded — houses that had always been on dry land before. A chemical plant blew up, twice. Toxic chemicals oozed from Superfund sites. Dozens died in the deluge, mostly by drowning.

And all the while, alongside the heartbreak and horror, I kept thinking about a strange harbinger: jellyfish.

Diaphanous in form yet menacing in sting, jellyfish have a powerful capacity to capture our imagination. They undulate in a primal rhythm, blinking open and closed like eyes that can peer into the soul of the sea. And what they are seeing are changes produced by us here on land.

Because we burn fossil fuels, which release greenhouse gasses, not just the atmosphere but ocean waters are warming. At the same time, our ship traffic transports animals to new places, and sometimes these exotics find home-like conditions where in the past those conditions would have been unsuitable.

That’s what happened in the eastern Mediterranean, where a jellyfish from the tropical Indian Ocean has found warm, homey waters and now forms huge aggregations called blooms that stretch for tens of miles every summer. The fierce stings of these animals chase beach-goers out of the water. Their gooey bodies clog machinery at power plants, halting operations.

Rampant coastal development provides new habitat for a jellyfish stage called a polyp that looks like a sea anemone. When it finds a hard surface like a dock or a jetty to grow on, a single polyp can proliferate into a dozen or even more medusae. And fields of polyps grow on those hard structures.

That’s likely what happened off the coast of Italy, where gas platforms are thought to be the home for a new invasion of jellyfish. In the twentieth century in the Adriatic Sea, moon jellies, pinkish with their characteristic four-leafed clover on top, were a rarity. Now they are ubiquitous.

And as we wash pollution into our waters, we create low-oxygen environments. Some jellyfish, with their low metabolic rate due to their a-cellular jelly insides, can survive more easily there than fish, with their oxygen-guzzling muscled tissues.

That is part of what happened in the Yellow Sea, where pollution is unchecked. It is the birthplace of a maroon jellyfish that reaches a weight of 500 pounds. Blooms of the creature were a once-a-generation event before 2000 — the kind of thing fishermen mentioned to their sons. But jellyzillas swept from China in the Tsushima Current, have plagued Japan’s coast almost every year of the 21st century. In 2009, a fishing boat caught so many that their weight capsized the vessel. (Fortunately, the crewmembers were rescued.)

And our lack of oversight of the fishing industry, which has removed more than 90% of the large fish from the seas, has depleted the predators of jellyfish as well as their competitors. Jellyfish are eaten by some fish, and jellyfish eat the same small zooplankton that fish do. The ecological vacuum left by unrestrained fishing can allow jellyfish to expand their influence in marine ecosystems.

That’s what happened off the coast of Namibia, once one of the world’s most productive fisheries. Prior to 1960s, the rich Benguela current nourished a yield of a million tons of fish annually, until a fishing free-for-all depleted the ecosystem. Today, Namibian waters contain three times more jellyfish than fish by weight. There are reports of seabirds and seals starving.

While researching jellyfish for the last six years, I’ve grown to understand that in the places where these large, pervasive jellyfish blooms occur, our oceans’ systems are out of whack. The blooms are a call for us to become better stewards of our oceans.

There’s a real disconnect between us on land and what happens in the ocean. We are ultimately terrestrial creatures. It’s easy to ignore a power plant clog in the Mediterranean, a marine ecosystem disrupted in Japan, a fishing industry lost in Namibia. There seem to be more pressing things closer at hand.

But this summer proved that disconnect is dangerous. Hurricane Harvey was even more evidence that what the jellyfish are telling us about the damaged oceans is not just a warning about an off-in-the-future time or a place somewhere else. This is not a vague the-world-is-all-connected idea. Harvey is a tangible, physical cost of our disregard. The health of the ocean is our health too.