Stephanie M. answered • 06/08/15

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The amount of argyrol in a given solution is (percent)(amount). So:

There are 0.0x = 0 ounces of argyrol in the water solution.

There are 0.15(20) = 3 ounces of argyrol in the 15% solution.

There are 0.1(20 + x) = 0 + 3 ounces of argyrol in the resulting 10% solution.

Use that last equation and solve for x:

0.1(20 + x) = 3

2 + 0.1x = 3

0.1x = 1

x = 10 ounces of water