if one - third of one fourth of a number is 15 , then 3 - tenth of that number is : Choose the correct choice.
A) 35  B) 25  C) 45  D) 54  E) 52

Rationale: let the number be x . then , 1 / 3 of 1 / 4 of x = 15 x = 15 * 12 = 180 so , required number = ( 3 / 10 * 180 ) = 54 . answer : d
Answer: D