There are 600 students in a school. 60% of the students are girls. 30% of the girls and 45% of the boys participate in the school choir. How many students are NOT in the choir?
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Worked Solution
Step 1: Number of girls = 60% × 600 = 360. Number of boys = 40% × 600 = 240.
Step 2: Girls in choir = 30% × 360 = 108.
Step 3: Boys in choir = 45% × 240 = 108.
Step 4: Total students in choir = 108 + 108 = 216.
Step 5: Students NOT in choir = 600 − 216 = 384.
Correct answer: 384
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