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

Algebra ->  Customizable Word Problem Solvers  -> Misc -> 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      Log On

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