The average age of students of a class is 13.8 years. The average age of boys in the class is 14.6 years and that of girls is 13.4 years. The ratio of the number of boys to the number of girls in the class is:

2:3

1:2

3:4

3:2

Solution: Assume the ratio x : 1. then, x*14.6 + 1*13.4 = (x+1)*13.8 (14.6-13.8)x = 13.8-13.4 => x = 0.4/0.8 => = 2/3. .'. Required ratio = 1\2 = 1:2

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