Math
posted by HELP!!! ASAP!!! .
Information: Juan plans to build a bookcase t store his paperback books, DVDs, and CDs. he has lumber that he will use for the sides and back of the bookcase. Juan plans for his bookcase to have five shelves including, the top and bottom shelves. Each shelf will be 2 1/2 feet long.
Question: Juan bought a piece of pine limber that is 18 feet long. Does he have enough lumber to make the five shelves? If not, how much more does he need? If so, how much will be left over?
Juan measured the location of his bookcase and realized that he could only fit a bookcase with shelves that are 1 3/4 feet wide. What is the maximum number of shelves Juan could build for this new bookcase using the lumber he bought?

5 * 2 1/2 = ?
18 / 1.75 = ? 
On the first question I got 7 feet of lumber left

No.
Multiply:
5 * 2 1/2 = ?
Subtract the product from 18. What do you get? 
5 1/2

Right. He has 5 1/2 feet left over.

Thank you so much!! Bye:)

You're welcome.