JAMB 2024 Economics · Question 10

If the population of a school is 600 and 60% are In JSS, how many students are in SSS?

Options

A.244
B.240
C.224
D.204

Answer: B. 240

Explanation written with AI and checked against the answer key

Analyze the question: The school has 600 students in total. 60% are in JSS. We need the number in SSS, assuming every student is either in JSS or SSS. Concept: Percentages split a whole into parts. If JSS is 60%, then SSS is the remaining percentage: SSS % = 100% − 60% = 40% Solution: Number in JSS = 60/100 × 600 = 360 Number in SSS = 600 − 360 = 240 Check: 40/100 × 600 = 240 ✓ Answer: 240 students, which is option B. Tip: When a question gives one percentage of a whole with only two groups, find the other group's percentage first (100% − given %). Then calculate once. This saves time and reduces mistakes. Here, 40% of 600 is 4 × 60 = 240.

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