Multiple choice

In a class of 39 students, there are 26 girls. The average weight of these girls is 42Kgs and the average weight of the full class is 48kgs. What is the average weight (in kgs) of the boys in the class?

  1. 54

  2. 66

  3. 60

  4. 62

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total class weight = 39 × 48 = 1872 kg. Girls' total weight = 26 × 42 = 1092 kg. Number of boys = 39 - 26 = 13. Boys' total weight = 1872 - 1092 = 780 kg. Average weight of boys = 780 ÷ 13 = 60 kg.