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1. A

2.  D
Solution:
1 1/4 + 2 4/5 + 3 5/8 + 2 3/10
[1 1/4 + 3 5/8] + [2 4/5 + 2 3/10] [1 + 3 + 1/4 + 5/8] + [2 + 2 + 4/5 + 3/10] [4 + 11/10] + [4 + 7/8] [4+ 4 + 11/10 + 7/8] [8 + 79/40] = 9 39/40

3. E
1008 ÷ 16 × 3/7 + 19 × 204 – 13 × 15
1008/16 × 3/7 + 3876 – 185
27 + 3876 – 185

4. B
(0.6)5/4 ÷ (0.36)3/8 = (0.6)5/4 ÷ (0.6)2 * 3/8 = (0.6)5/4 ÷ (0.6)3/4 = (0.6)5/4 – 3/4 = (0.6)1/2
Similarly, (0.3)13/12 ÷ (0.09)7/24 = (0.3)1/2
So (0.6)1/2 × (0.3)1/2 = (0.18)1/2
So (0.18)1/2 = (0.18)1-x gives 1/2 = 1 – x, So x = 1/2

5. C

6. A

(0.4)17/16 ÷ (0.16)3/32 × (0.3)5/4 ÷ (0.09)-3/16
= (0.4)7/8 × (0.3)7/8

7. E

8. C

9. D

10. B

 

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