How many days a bag of chicken food can feed 12 chickens if a bag feeds 18 chickens for 54 days?

If a bag of chcken food is divided among 18 chickens, then it lasts 54 days.

If It is given to 1` chicken, it will last (54*18) days

                                                 = 972 days

Now,

If again, the bag of chicekn food is divided among 12 chickens, the days will be divided by 12.

Thus,

Days = 972/12

         = 81