SOLUTION: A 10L tank of salt water is composed of 20% salt and 80% water. How many litres of salt water should be removed, and replaced with salt, so that the salt water consists of 30% salt

Question 1084422: A 10L tank of salt water is composed of 20% salt and 80% water. How many litres of salt water should be removed, and replaced with salt, so that the salt water consists of 30% salt?

Answer by josgarithmetic(39614) (Show Source): You can put this solution on YOUR website!
Remove 0.2x of salt and add or replace this with 1.0x of salt. The first term is amount salt as the 20% solution. The second term is pure undissolved salt.

-------------this is assuming no change of volume which could be the wrong assumption. Densities may also be important for the problem's description.
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