Introduction to Alligation

In pharmacy, solutions or mixtures of solids with different concentrations of the same component can be mixed together to produce a solution or mixture with a new concentration of the component.

You have to be able to calculate the concentration of the resulting solutions or mixtures.

2000ml of 40% (v/v) Ethanol, 1000ml of 10% Ethanol and 1500ml of 25% Ethanol are mixed together. What is the concentration of Ethanol in the final solution?

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