Answer :

Given ratio 7:5
Let the number of boy and girls be 7x and 5x respectively.

Then, 7x = 5x + 8

7x - 5x = 8

2x = 8

x = 4


Also, 
7x = 7(4) = 28
5x = 5(4) = 20

Therefore, the number of girls is 20 and the number of boys is 28. The total class strength is 48.

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