A rectangular prism has length 5, width 4, and height 3. What is its total surface area?

A rectangular prism has three pairs of identical faces. The surface area is $2(lw+lh+wh)=2(5\cdot4+5\cdot3+4\cdot3)=2(20+15+12)=2(47)=94$, choice H. Choice F ($47$) is half the surface area, because it counts each pair of faces once instead of twice. Choice G ($60$) is the volume $5\cdot4\cdot3$, a different quantity measured in cubic units. Choice J ($120$) is double the volume. Make sure the question asks for total surface area, which includes all six faces, rather than volume.