The average mass of 3 boys is 42 kg. If a 4th boy with a mass of 50 kg joins them, what is the new average mass of the 4 boys?
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Worked Solution
Step 1: Find the total mass of the 3 boys: 3 × 42 kg = 126 kg.
Step 2: Add the mass of the 4th boy to find the new total mass: 126 kg + 50 kg = 176 kg.
Step 3: The new number of boys is 4.
Step 4: New average mass = Total mass ÷ Number of boys
Step 5: New average mass = 176 kg ÷ 4 = 44 kg.
Answer: 44 kg
Correct answer: 44 kg
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