there are 18 girls and 40 boys in the liblary.if 5/9 of the girls and 3/8 of the boys are reading.how many children are reading.?
5 / 9 of 18:
( 5 / 9 ) ∙ 18 = 5 ∙ 18 / 9 = 5 ∙ 2 ∙ 9 / 9 = 5 ∙ 2 = 10
3 / 8 of 40:
( 3 / 8 ) ∙ 40 = 3 ∙ 40 / 8 = 3 ∙ 5 ∙ 8 / 8 = 3 ∙ 5 = 15
10 + 15 = 25