SOLUTION: A chemistry experiment calls for a 20% solution of copper sulfate. You have 150 milliliters of a 30% solution. How many milliliters of an 18% solution should you add to get a 20% s

Question 359726: A chemistry experiment calls for a 20% solution of copper sulfate. You have 150 milliliters of a 30% solution. How many milliliters of an 18% solution should you add to get a 20% solution?
Found 2 solutions by ewatrrr, Fombitz:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi
Let x reprsent the milliliters of an 18% solution to add
.30*150ml + .18x = .20(150ml + x)
.30*150ml + .18x = .20*150ml + .20x
.10*150ml = .02x
750ml = x
checking our answer
45 + 135 = .20*900 = 180
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let be the amount of 18% solution.

ml
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