posted by help .
Information:Juan plans to bulid a bookcase to store his paperback books DVDs and CDs he has lumber that he will use for the sides and back of the bookcase the bookcase will have 5 shelves in each shelf will be two and a half feet long
Question: juan bought lumber that is 18 feet long.
a.does he have enough lumber to make the five shelfs? If not, how much more does he need if so, how much will be left over?