What makes 3 +7 +2= +2 true?

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

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

John has 1/2 pound of oranges to share with julie. if they share the oranges equally, how much will each of them have?