SOLUTION: 15 men drink 6 gallons of water in 20 days. Find how many gallons 25 men will drink in 5 days ?

Write this proportion


     = .


Here x is the number of gallons of water under the problem's question.


The proportion says that the rate of drinking per person per day is the same in both cases.


From the proportion


    x =  = 2.5 days.    ANSWER