Question
In 2023, ratio of boys and girls in a school was 5:7,
respectively. In 2024, 25 boys join and 35 girls leave the school, so the ratio becomes 1:1. Find the number of students in 2023.Solution
Let the number of boys and girls in 2023 be '5a' and '7a', respectively. ATQ, (5a + 25) : (7a − 35) = 1 : 1 Or, 5a + 25 = 7a − 35 Or, 2a = 60 Or, ‘a’ = 30 Therefore, required number of students = 5a + 7a = ‘12a’ = 12 × 30 = 360
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