Water and Wine
We removed X liters of wine from a barrel and added X liters of water in this same barrel.
After, we removed from this barrel more X liters of his content and added more X liters of water.
After, the barrel has 36 liters of water and 64 of wine.
Find X
The answer is 20.
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1 solution
(100-x)^2/100^2=36/100 X=20