Find the sum of all whole numbers less than 50 that are multiples of 4 but not multiples of 12.

Step-by-step solution

1. List multiples of 4 below 50: $4,8,12,16,20,24,28,32,36,40,44,48$.
2. Identify multiples of 12 among them: $12,24,36,48$.
3. Exclude those numbers, leaving $4,8,16,20,28,32,40,44$.
4. Add the remaining numbers: $4+8+16+20+28+32+40+44=192$.
5. The sum is $192$.

Concept tested: Multiples and exclusion

Published 16 October 2026 · How this solution was prepared and checked