Five boys in a P5 class have an average mass of 48 kg. When a new boy joins the group, the average mass of all six boys becomes 50 kg. What is the mass of the new boy?
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Worked Solution
Step 1: Find the total mass of the original 5 boys.
5 × 48 = 240 kg
Step 2: Find the total mass of all 6 boys after the new boy joins.
6 × 50 = 300 kg
Step 3: Find the mass of the new boy.
300 − 240 = 60 kg
The mass of the new boy is 60 kg.
Correct answer: 60 kg
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