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lets say no. of girls is x

total sum of ages of the class:
60 boys * 10.6 yrs + x girls * 10.1 years = (60 + x) * 10.5 years
or, 636 + 10.1x = 630 + 10.5x
or, 0.4x = 6
x = 6/0.4
no. of girls = 15

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Q: The average age of boys and girls in a class is 10.5 yrs that of boys is 10.6 and that of girl is 10.1 if there are 60 boys in calss how many girls are there?
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