Question 250072
each board is 2 feet and 7 inches long.


this is equivalent to (2 * 12) + 7 = 31 inches long.


the lumber yard sells only 12 foot boards.


this is equivalent to (12 * 12) = 144 inches long.


he can get 144/31 = 4.64516129 shelves out of each board.


since he needs a full shelf, that means he can only get 4 shelves out of each board.


he needs 30 shelves / 4 equals 7.5 boards.


since he can't buy a partial board, he has to buy 8 boards.


8 * 4 = 32 which means he will have 2 extra shelves.


your answer is selection (C).