Mainly-need-a-general-solution-for-x-number-of-chickens

If a hundred chickens eat a hundred bushels of grain in a hundred days, how many bushels will ten chickens eat in ten day?  And, if on average, one and a half of these chickens lay an egg and a half in a day and a half, how many days will it take a chicken to lay one and a half dozen eggs? How could you solve this problem for any number of chickens?