Question
A school has 720 students. The ratio of boys to girls is
4:2. Among the boys, the passed to failed ratio is 9:3. Among the girls, the passed to failed ratio is 6:2. Find how many students passed the exam.Solution
ATQ,
Number of boys = (4/6) × 720 = 480
Number of girls = (2/6) × 720 = 240
Required number of students = (9/12) × 480 + (6/8) × 240 = 360 + 180 = 540
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