# arithmetic

posted by
**chrissy** on
.

this is difficult for me...

#5 A carpenter needs 4 boards, each 2 feet 9 inches long. If wood is sold only by the foot, how many feet must he buy? the answer is 11 but how do you get 11?

You need to multiply 4 times 2 3/4 to find the total amount of board feet the carpenter needs. (9 inches is 9/12 or 3/4 of a foot.) Do you get 11 by doing this?

yes I do but how do you get 2 3/4??

I don't get this setting up a ratio buisness???

Please see your answer below.