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.


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?