If 30 : 50 = 6 : x then value of x is

Y is directly proportional to x², x = 2 and y = 20, value of x when y = 1.25 is

A. 0.3

B. 0.6

C. 0.5

D. 0.8

Y = 3/x² y and x are

A. directly related

B. inversely related

C. not related

D. non of above

If y = x, then both are

A. inversely related to each other

B. directly related to each other

C. not related

D. none of above

7 identical pipes fill 3 identical tanks 45mins, 5 pipes fill one of these tanks in

A. 20min

B. 21min

C. 15min

D. 10min

Q is directly proportional to √p Q = 21 when p = 9, the value of Q when p = 81 is

A. 63

B. 64

C. 56

D. 67