JAMB - Mathematics (2025 - No. 12)
The average weight of 15 iron bars is 1000 kg. If the heaviest iron bar is removed, the average weight is reduced by 5 kg. Find the weight in kg of the heaviest iron bar.
1170kg
1270kg
1070kg
1370kg
Explanation
Total weight = 15 × 1000 = 15000 kg.
New average = 1000 - 5 = 995 kg.
Total for 14 bars = 14 × 995 = 13930 kg.
Heaviest = 15000 - 13930 = 1070 kg.
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