The rule for the number of fish in a home aquarium is 1 gallon of water for each inch of fish length. Marta's aquarium holds 21 gallons of water and Hank's aquariurn hold 33 gallons of water. The aquarium
holds two types of fish, fish A and fish B. If Marta bought 3 of fish A and 2 of fish B, and Hank bought 3 of
fish A and 4 of fish B, how long is fish A and how long is fish B?