Answer: 8/5 gallons of paint.
Step-by-step explanation:
Ok, you need 2/5 gallons of paint to paint a dog house.
Then if you need to paint 4 dog houses, then you need 4 times the 2/5 gallons of paint.
This is equal to:
4*(2/5 gallons) = (4*2)/5 gallons = 8/5 gallons
Then you need 8/5 gallons of paint to paint 4 dog houses.