10 marbles in each bag...2/10 are striped...2/10(10) = 20/10 = 2 are striped.So in every bag of 10 marbles, 2 are striped. So if there is 3 bags of marbles....then (3 x 2) = 6 are striped. <== he needs 6 striped
i divided 5 from 145 and got 29. i multiplied 29 and 3 and got 87. 87 is the girls total. then subtracted 87 from 145 and got 58. 58 is the boys total.