How many 2(1/2) foot-long shelves can be cut from a wooden board 9 feet long? how much wood will be left over?

Answer 1

9/2.5 = 3.6
so
3 whole shelves
plus 0.6 ft left over

Answer 2

9/2.5 = 3.6

Three pieces can be cut with 1.5 feet left over.

Answer 3

Use Ms Sue's answer for left over (.6*2.5 = 1.5 ft)