SOLUTION: Sarah has 65 milliliters of a 30% solution. How many millimeters of 75% solution should she add to obtain the required 35% solution?

Question 1049113: Sarah has 65 milliliters of a 30% solution. How many millimeters of 75% solution should she add to obtain the required 35% solution?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of the 75% solution needed
= ml of concentrate in the 30% solution
= ml of concentrate in the 75% solution
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8.125 ml of the 75% solution is needed
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