Tampines Primary School has 600 pupils. 55% of the pupils are girls. 20% of the girls are in the school choir. How many girls are in the school choir?
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Worked Solution
Step 1: Find the number of girls. 55% of 600 = 55/100 × 600 = 33000/100 = 330 girls.\n
Step 2: Find 20% of the girls who are in the choir. 20% of 330 = 20/100 × 330 = 6600/100 = 66.\n
Step 3: 66 girls are in the school choir.\nCheck: 66 ÷ 330 = 0.20 = 20% ✓ and 330 ÷ 600 = 0.55 = 55% ✓.
Answer: 66
Correct answer: 66
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