Question
Ratio of number of boys to girls in a school of 840
students is 5:3. Ratio of number of boys who passed to those who failed in an exam is 11:4 whereas ratio of number of girls who passed to those who failed in the exam is 5:2. Find the number of students who passed in the exam.Solution
ATQ,
Number of boys = (5/8) × 840 = 525
Number of girls = (3/8) × 840 = 315
Required number of students = (11/15) × 525 + (5/7) × 315 = 610
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