If 23+37=60 does 23+37+9=60+9

How do i do this activity, is appreciated

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

George has seven boxes of five pencils. giulio three boxes of eight pencils. one of the boys arranges all his pencils equally into two groups. was this george or giulio how many are in each group explain