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

Problem restatement
Given (1/3) of (1/4) of N equals 15. Find (3/10) of N.

Given data

• (1/12)N = 15

Concept/Approach
Compute N from the first relation, then take 3/10 of it.

Step-by-step calculation
N = 15 × 12 = 180 (3/10)N = (3/10) × 180 = 54

Verification/Alternative
Check: (1/12) × 180 = 15, consistent.

Final Answer
54