SOLUTION: How many liters of water must be added to 8 liters of a 40% acid solution to obtain a 10% acid solution

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8 liters of 40% solution contains or 3.2 liters of acid.
This 3.2 liters represents 10% of the final solution, so the volume of that solution is or 32 liters of solution.
To go from 8 liters to 32 liters you add 24 liters of water.