Question
In 2023, ratio of boys and girls in a school was 3:5,
respectively. In 2024, 30 boys join and 10 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 '3a' and '5a', respectively. ATQ, (3a + 30) : (5a − 10) = 1 : 1 Or, 3a + 30 = 5a − 10 Or, 2a = 40 Or, ‘a’ = 20 Therefore, required number of students = 3a + 5a = ‘8a’ = 8 × 20 = 160
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