Question
Total number of students in a class is 1800, and the
ratio of number of boys to girls is 4:5. If the number of boys and girls is increased by y% and (y – 3)% respectively, then the total number of students in the class will become 2070. Find the value of y. (Can calculate approximate value)Solution
ATQ, Number of boys in the class before increase = (4/9) ×1800=800 Number of girls in the class before increase = 1800 – 800 = 1000 According to the question: 
So, the value of y is approximately 16.67%.
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