Word problem. Need equation and solution

Question

Colby needs 29 liters of cola for a party.  At the store, you can buy cola in containers holding 2,4,6,8 gallons.  If 1 gallon = 4 liters what size container should Colby buy?

Answer 1

If 1 gallon contains 4 liters then

2 gallons = 8 liters
4 gallons = 16 liters
6 gallons = 24 liters
8 gallons = 32 liters

Colby should buy the 8 gallon container to get at least 29 liters of soda.