1.

In a school the ratio of boys to girls is 3 : 5. When 12 girls leave the school, the ratio becomes 9 : 1 3 . How many boys are there in the school ?

Answer»

54



3x/5x - 12 = 9/13 = 108 = (45 - 39)X
= x = 108/6 = 18
No. of boys = 3 x 18 = 54



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