15. Two-fifth of one-fourth of three-seventh of a number is 15. What is half of that number ?

A.94

B.96

C.188

D.None of these

16. One-fifth of a number exceeds one-seventh of the same by 10. The number is :

A.125

B.150

C.175

D.200

17. If a * b = 2a ? 3b + ab, then 3 * 5 + 5 * 3 is equal to :

A.22

B.24

C.26

D.28

18. 7 is added to a certain number; the sum is multiplied by 5; the product is divided by 9 and 3 is subtracted from the quotient. The remainder left is 12. The number is :

A.20

B.30

C.40

D.60

19. On simplification, 3034 ? (100.2 + 20.04) is equal to :

A.2543

B.2984

C.2993

D.3029

20. 52.416 ? 18.72 + 6.28 = ?

A.2.09664

B.8.36

C.9.08

D.9.80

21. 5.8 x 2.5 + 0.6 x 6.75 + 139.25 = ?

A.157.3

B.157.8

C.158.4

D.160.30

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