self Maths Puzzle

A beaker contains 180liters of alcohol.In first day 60liters of alcohol is taken out and replaced by water.2nd day 60liters of mixure is taken out and replaced by water.and the process continues.At the end of 3rd day what is the quantity of alcohol

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self Other Question

The side of a cube is increasing @ 13 cm/sec. Determine the rate of increase in its surface area when the side is equal to 67 cm. FRIENDS THERE! COULD YOU PLEASE HELP ME BY PROVIDING LATEST TCS PLACEMENT PAPERS. 3 MORE DAYS FOR THE TEST AND AM STILL NOT CLEAR HOW TO GO ABOUT AS I'VE COME TO KNOW THAT QUESTIONS THIS YEAR ARE TOUGHER THAN PREVIOUS YEARS'. ALSO THE CHANGE IN PATTERN IS WORRYING ME. ANY ATTACHMENTS CAN BE MAILED TO praneeSharma@gmail.com . THANKS