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The average weight of 12 boxes is 20 kg. If the heaviest box weighs 25 kg and the lightest weighs 11 kg, what is the average weight of the remaining boxes?

1. 19.8 kg
2. 20.4 kg
3. 20.6 kg
4. 21.2 kg

Correct answer: 20.4 kg

Solution

Total weight of 12 boxes is $12\times 20=240$ kg. Removing the heaviest and lightest boxes leaves $240-(25+11)=204$ kg for 10 boxes, so the average is $204/10=20.4$ kg.

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