The number of boys and girls in the class are in the ratio 9:7 . The number of boys is 10
more than the number of girls. What is the total class Strength?
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let the no. of boys be 9x and no. of girls be 7x
9x - 7x = 10
2x = 10
x = 5
no.of boys = (9*5) = 45
no.of girls = (7*5) = 35
total strength of class = (45+35) = 80
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