Question

If one third of one-fourth of a number is 15, then three-tenth of that number will be which of the following?

• A. 61
• B. 54
• C. 72
• D. 63
• E. 48

Hint:

Work backwards: "one third of one fourth" means multiply by 1/12.

Answer 1

The Correct Option is B

Step 1: Let the number be $x$. One-third of one-fourth of $x$ = $\frac{1}{3} \times \frac{1}{4} \times x = \frac{x}{12} = 15$.
Step 2: So $x = 15 \times 12 = 180$.
Step 3: Three-tenth of $x$ = $\frac{3}{10} \times 180 = 3 \times 18 = 54$.
Step 4: Final Answer: 54.