The average mass of 9 boys is 42 kg. When the heaviest boy left the group, the average mass of the remaining 8 boys was 40 kg. Find the mass of the boy who left.
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Worked Solution
Step 1: Total mass of 9 boys = 9 × 42 = 378 kg.
Step 2: Total mass of remaining 8 boys = 8 × 40 = 320 kg.
Step 3: Mass of the boy who left = 378 − 320 = 58 kg.
Answer: 58 kg
Correct answer: 58 kg
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