There were some boys and girls in the school hall at first. 40% of the boys and 10% of the girls left the school hall. As a result, 3/4 of the pupils remained in the school hall.There were 12 more girls than boys who remained in the school hall. how many boys were there at first?

Answer 1

.6b + .9g = 3/4 (b+g)
.9g = .6b + 12

Now just solve for b and g

Answer 2

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