Question
In a class of 40 students, 60% are boys and the rest are
girls. If 50% of the boys and 70% of the girls passed the exam, how many students failed the exam?Solution
Total number of students = 40 Number of boys = 60% of 40 = 24 Number of girls = 40 - 24 = 16 Number of boys who passed = 50% of 24 = 12 Number of girls who passed = 70% of 16 = 11.2 â 11 Total passed = 12 (boys) + 11 (girls) = 23 Number of students who failed = 40 - 23 = 17 Thus, 17 students failed the exam. Correct option: d
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