The average mass of 4 boys is 38 kg. When a fifth boy joins them, the average mass of the 5 boys becomes 40 kg. Find the mass of the fifth boy.
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Worked Solution
Step 1: Find the total mass of the original 4 boys.
Total of 4 boys = 4 × 38 = 152 kg.
Step 2: Find the total mass of all 5 boys after the fifth joins.
Total of 5 boys = 5 × 40 = 200 kg.
Step 3: The mass of the fifth boy is the difference.
Mass of fifth boy = 200 − 152 = 48 kg.
Answer: 48 kg
Correct answer: 48 kg
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