MATH PROBLEM : Find water container... (Solution)

You can find the problem at this URL...
https://teachyleaf.blogspot.com/2020/05/math-problem-find-water-container.html

5 containers - Milk, 1 container - Water
One customer will buy milk twice as much as the other

C1 = x liter milk, C2 = 2x liter milk
Total milk = 3x liter

It means that the addition of 5 containers of milk must be divisible by 3
So, Water = 20 liter
& Milk = (15+16+18+19+31) = 99 liter [divisible by 3]

Customer 1 will buy (15+18) = 33 liter
& Customer 2 will buy (16+19+31) = 66 liter

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