Ryan is cleaning out his room. his sister dives him 4 boxes of books to put with the 3 books he already had. when he finishes he discovers he know has 35 books on his shelves. how many books were in each box. Write an algebraic expression to represent this problem then solve.

help plz

One shot. if 60% of 10 is 6, then what is 70%? we know it would be seven (since 60% is mathematically 60/100, or 6/10, then 70% is 70/100, or 7/10) but we can check anyway using ratios: 6 : 60% = x : 70%*inverse multiplicationx * 60% = 6 * 70%*divide both sides by 60%x = (6 * 70%) / 60%x = 7and since he has made 6 shots already, he would need just one more to get 7 shots or 70%. if the explanation is too confusing, comment and i will try to