Khali has to shovel snow off the sidewalk in front of his house. The sidewalk is 20 feet long and 2 feet wide. If the snow is $\frac{1}{2}$ foot deep, how many cubic feet of snow does Khali have to shovel off the sidewalk?
I need to find the volume of snow on the sidewalk, which is a rectangular prism. The formula for the volume of a rectangular prism is length times width times height. In this case, the length is 20 feet, the width is 2 feet, and the height is $\frac{1}{2}$ foot. So I can plug these values into the formula and simplify: $V = 20 \times 2 \times \frac{1}{2} = 20 \times 1 = 20$. Therefore, Khali has to shovel 20 cubic feet of snow off the sidewalk.

