In each case divide the price by the number of cans. The best buy is the lowest price. $12.53/7 = $1.79 $5.97/3 = $1.99 $7.95/5 = $1.59 $8.34/6 = $1.39
The fourth ad, $8.34 for 6 cans results in the lowest price per can, $1.39. The fourth ad is the best buy.
