April put gasoline in 4 of her 5 gallon cans and 6 of her 2 galloncans..she filled all the cans to the exact capacity. how many gallons of gas did she buy?

To solve this problem you must follow the proccedure below:

 1. You have the following information: 

 - April put gasoline in 4 of her 5 gallons cans.
 - She put gasoline in 6 of her 2 gallons cans. 

 2. Let's call "x" to the number of gallons of gas that she bought. Therefore, you have:

 x=(4x5 gallons)+(6x2 gallons)
 x=20 gallons+12 gallons

 3. Finally, the result is:

 x=32 gallons

 How many gallons of gas did she buy?

 The answer is: 32 gallons