Question
Total number of students in a class is 2400, and the
ratio of number of boys to girls is 3:5. If the number of boys and girls is increased by z% and (z – 4)% respectively, then the total number of students in the class will become 2736. Find the value of z.Solution
ATQ, Number of boys in the class before increase = (3/8) ×2400 = 900 Number of girls in the class before increase = 2400 – 900 = 1500 According to the question: 
So, the value of z is 16.5%.
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