self Maths Puzzle

a container has a capacity of 2 gallons and is full of spirit .4 gallons of spirit is drawn out and the container is again filled with water. this process is repeated 5 times. find out how much spirit is left in the resulting mixture finally?

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self Other Question

Tomorrow I have TCS placements in college .. Guys pls give all your suggestions.. I have solved many questions from this site also doing lots of homework about company .. I am ECE branch. Pls tell hw will technical round be? two vessels contain spirit and water mixed respectively in the ratio of 1:3 and 3:5 . find the ratio in which these are to be mixed to get a new mixture in which the ratio of spirit to water is 1:2.