Question 277740: To build a set of book shelves, a carpenter needs 30 identical boards, each 2 feet 7 inches long. For this type of wood, the lumber yard sells only 12 foot long boards. How many 12 foot long boards must the carpenter purchase?
A.6 B.7 C.8 D.9 E.More than 9
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! To build a set of book shelves, a carpenter needs 30 identical boards, each 2 feet 7 inches long. For this type of wood, the lumber yard sells only 12 foot long boards. How many 12 foot long boards must the carpenter purchase?
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# of shelves he gets from each 12' board: 12'/2'7" = 144"/31" = 4.65
Round down to get 4 shelves from each 12' board
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# of boards needed = 30/4 = 7 1/2
Round up to get 8 boards
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He will need 8 12' boards.
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Cheers,
Stan H.
A.6 B.7 C.8 D.9 E.More than 9
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