Destiny has 4 liters of 49% acid. how much water should she add to make a solution that is 14% acid?

Destiny has 4*.49 = 1.96 L of acid. In order for the 1.96 L of acid to be 14% of the solution, there must be 1.96/.14 = 14 L of solution.

Destiny must add 14 L -4 L = 10 L of water to make the desired solution.

Subtracting is the opposite of adding

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