"originally 1,155 cubic inches of paint in the 5 gallon bucket"

"used half of the paint" and "paint that is left over? Remember that half the paint is left in the bucket"

There is (1/2)1155 = **577.5 in**^{3} left in the bucket.

The volume of the rectangular prism is 12*8*5 in^{3} = **480 in**^{3}

Will 577.5 in^{3} of paint fit in 480 in^{3} ?