The average mass of 4 boys is 35 kg. When a 5th boy joins the group, the new average mass becomes 36 kg. What is the mass of the 5th boy?
Show Worked Solution
Worked Solution
Step 1: Total mass of 4 boys = 4 × 35 kg = 140 kg.
Step 2: Total mass of 5 boys = 5 × 36 kg = 180 kg.
Step 3: Mass of the 5th boy = Total mass of 5 boys - Total mass of 4 boys
Step 4: 180 kg - 140 kg = 40 kg.
Answer: 40 kg
Correct answer: 40 kg
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