Multiple choice

A group consists of 20 boys and 30 girls. The average weight of a boy is 75 kg and that of a girl is 50 kg. The average weight of the group is-

  1. $60 kg$
  2. $66 kg$
  3. $62 kg$
  4. $69 kg$
  5. $50 kg$
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A Correct answer
Explanation

Total weight of boys = 20 × 75 = 1500 kg. Total weight of girls = 30 × 50 = 1500 kg. Total weight of group = 1500 + 1500 = 3000 kg. Average weight = 3000 ÷ 50 = 60 kg. This is a weighted average problem.

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