How many square yard are in a 20x 40 area?

Question

I need to cover a 20x40 area with asphalt. The cost is $18 a square yard. How much will it cost me?

Answer 1

The problem statement does not specify the units of the area.  Is it (20 yards) x (40 yards)?  If so, then

cost = (area in square yards) x ($ per square yard) = (20 x 40 yards²) x ($18 / yards²) = $14,400