A P4 class of 40 pupils is surveyed about their favourite snack. The pie chart shows the results. Curry puff is 25%, Pandan cake is 30%, and Kaya toast is 20%. The remaining slice represents pupils whose favourite snack is Ondeh-ondeh. How many pupils chose Ondeh-ondeh as their favourite snack?
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Worked Solution
Step 1: A pie chart's slices always sum to 100%. List the known slices: Curry puff 25%, Pandan cake 30%, Kaya toast 20%.
Step 2: Add the known percentages: 25 + 30 + 20 = 75%.
Step 3: Subtract from 100% to find the Ondeh-ondeh percentage: 100 − 75 = 25%.
Step 4: Find 25% of the total 40 pupils: 25% × 40 = (25 ÷ 100) × 40 = 10 pupils.
Step 5: Check by adding all four groups: 10 (ondeh-ondeh) + 10 (curry puff) + 12 (pandan cake) + 8 (kaya toast) = 40 pupils. ✓
Final answer: 10 pupils.
Answer: 10
Correct answer: 10
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