If one-third of one fourth of a number is 15, then three-tenth of that number is:

A 35

B 36

C 45

D 54

Correct Answer: Option D

let the number be X

now,

1/3 * 1/4 * X = 15

or, 1/12*X = 15

or, X = 15*12 = 180

Thus,

(3/10) * X = (3/10) * 180 = 3 * 18 = 54