word question

Question

A new machine makes a certain number of belts in 120 minutes. The old machine makes the same number of belts but in 155 minutes, taking 5 minutes longer per belt than the new machine. How many belts can be made by the old machine?

Answer 1

time differ=155-120=35 minuts

yu sae old masheen take 5 minuts longer per belt, so 35 minuts=7 belts

Answer 2

there are 5 shelves of books. 3 of the shelves hold 8 books each. 2 of the shelves hold 12 book each. how many books are on the shelves? if I remove 14 books on two shelves,     how many book are left on the shelves?