MathematicsSetsWAEC
In a class of 40 students, 25 offer Biology, 20 offer Chemistry and 8 offer neither. How many offer both subjects?
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Answer: B. 13
40 − 8 = 32 offer at least one, so 25 + 20 − x = 32 and x = 13.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.