I have to take care of my sister's cat while she is on vacation. The cat is a very picky eater and will only eat a certain cat food, available at two stores. Gristede's sells 12 cans for $18

PetSmart sells 20 cans for $26

Which store is offering the best deal on cat food?

Make sure to explain how you were able to determine which store offers the best deal on the cat food.

What us the equivalent ratio for 4:3