In a Primary 5 class, the average mass of 18 girls is 36 kg. When the heaviest and the lightest girls leave the room, the average mass of the remaining 16 girls is still 36 kg. Given that the lightest girl's mass is 24 kg, find the mass of the heaviest girl.
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Worked Solution
Step 1: Total mass of all 18 girls = 18 × 36 = 648 kg.
Step 2: Total mass of the 16 remaining girls = 16 × 36 = 576 kg.
Step 3: Sum of heaviest + lightest = 648 − 576 = 72 kg.
Step 4: Mass of heaviest = 72 − 24 = 48 kg.
Answer: 48 kg
Correct answer: 48 kg
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