Puzzle S3

Dear friends,

A milk man gets total 20 liters of milk daily from his 20 milk giving animals. Among those animals few are cows, few are buffallows and few are sheeps. Each cow will give 1 liter of milk daily, each buffallo will give 3 liters of milk daily and each sheep will give 1/4 liter of milk daily.

Now, you should calculate and tell me, among those 20 animals of milk man how many cows, how many buffallows and how many sheeps are there.

Sridhar Kesireddy