Ametal washer 1-inch in diameter is pierced by a 1/2 - inch hole. what is the volume of the washer if it is 1/8 - inch thick?

If you are saying the washer is 1/8" thick, then its volume is (1/8)(π/4 - π/16) = 3π/128 in^3 

Numerically, the volume is 0.07363 cubic inches

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No he does not because he can only cover 12 square feet from 15 square feet which he will still need 3 more. this is because if 3×5=15 square feet and 15-12=3 which thats the answer