A rectangular card has an area of 120.25 square inches. The card is 6.5 inches wide. How long is the card?

Since in a rectangle, a = lw, here we solve for l:

 

120.25 = 6.5l

120.25/6.5 = l

18.5 = l

 

Hence, the answer is 18.5 inches, and you can check that because 6.5 times 18.5 is 120.25.