Question
In a class of 80 students, 60% are boys, and the
remaining are girls. Out of the boys, 25% are good in mathematics, and out of the girls, 50% are good in mathematics. How many students are good in mathematics?Solution
Number of boys = 60% of 80 = 48. Number of girls = 80 - 48 = 32. Number of boys good in mathematics = 25% of 48 = 12. Number of girls good in mathematics = 50% of 32 = 16. Total students good in mathematics = 12 + 16 = 28.
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