On a certain pasture grass grows at a even rate. It is known that 40 cows can graze on it for 40 days before the grass is exhausted, but 30 cows can graze there as long as 60 days.

How many days would pasture last if 20 cows were to graze on it ?

It will take 80 days if 20 cows graze on it.

Posted by elton on 2003-09-23 21:22:26