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: 54
Let, the number = x According to the question, 1/3 of x of 1/4 = 15 1/3 × x ×1/4 = 15 x/12 = 15 x = 180 The three - tenth of that number = x of 3/10 = 180×3/10 = 54