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The average weight of 25 workers is 64 kg. If the manager is excluded, the average weight decreases by 1 kg. What is the weight of the manager?

1. 88 kg
2. 89 kg
3. 90 kg
4. 91 kg

Correct answer: 88 kg

Solution

The total weight of 25 workers is 25 × 64 = 1600 kg. After excluding the manager, the average becomes 63 kg for 24 workers, so their total is 24 × 63 = 1512 kg. Therefore, the manager's weight is 1600 - 1512 = 88 kg.

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