In a school, the ratio of boys to girls is 3 to 7. if there are 150 boys and girls in the school, how many boys are there?

A 45
B 75
C 90
D 105

Correct Answer: 45

let, the number of boys is 3x and the number of girls is 7x According to the question, 3x + 7x = 150 or, 10x = 150 or, x = 15 so, the number of boys is (3*15) = 45 ans: 45
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