15. Twenty times a positive integer is less than its square by 96. What is the integer ?

A.20

B.24

C.30

D.Cannot be determined

16. Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is :

A.4

B.5

C.6

D.10

17. The sum of a number and its reciprocal is one-eighth of 34. What is the produt of the number and its square root?

A.8

B.27

C.32

D.None of these

18. Two-third of a positive number and 25/216 of its reciprocal are equal. The number is:

A.5/12

B.12/5

C.25/144

D.144/25

19. Find a positive number which when increased by 17 is equal to 60 times the reciprocal of the number.

A.3

B.10

C.17

D.20

20. A positive number when decreased by 4 is equal to 21 times the reciprocal of the number. The number is :

A.3

B.5

C.7

D.9

21. The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is :

A.

B.

C.

D.289

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