SOLUTION: a chemist has 10 cm^3 of 20% salt solution. how many cubic centimeter of water should she add to produce a 5% salt solution?

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Question 854636: a chemist has 10 cm^3 of 20% salt solution. how many cubic centimeter of water should she add to produce a 5% salt solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
You hopefully mean percent weight per volume.
1 cm^3 = 1 ml.

Let u = how much volume, cm^3 of water to add.
20%2A10%2F%28u%2B10%29=5
Solve for u.