Multiple choice

The average weight of 20 boys in a class is 160 kg and that of the remaining 5 boys is 50 kg. Find the average weight of all the boys in the class.

  1. 138 kg

  2. 183 kg

  3. 140 kg

  4. 150 kg
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A Correct answer
Explanation

Total weight = (20 * 160) + (5 * 50) = 3200 + 250 = 3450. Total boys = 25. Average weight = 3450 / 25 = 138 kg.

AI explanation

The total weight of the first 20 boys is 20 times 160 kg, which equals 3200 kg. The total weight of the remaining 5 boys is 5 times 50 kg, which equals 250 kg. The combined total weight of all 25 boys is 3200 kg plus 250 kg, which equals 3450 kg. The average weight is 3450 kg divided by 25 boys, resulting in 138 kg.

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