Milk Jar Puzzle

Milk Problem again:

This is a slightly modification of the milk problem commonly asked in interviews. Infosys interview will focus on milk problem and this is the question asked in Infosys interview.

Questions: 

Using 4- gallon and 7-gallon jar fill or take 5 gallons?

Answer:

Fill Milk in 4 gallon first and pour it into 7-gallon jar.

Repeat the same.

Now, 1 gallon of milk remains in 4-gallon jar.

Shift the milk in 7-gallon jar and empty it.

Fill 1 gallon milk from 4-gallon jar into 7-gallon jar.

Fill Milk in 4 gallon and pour into 7-gallon jar making a total of 5 gallons