Question 326503
DUPLICATE See Answer 233746
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You can solve adding water to a 68% solution to make a 20% solution but not the other way around.
Let's add X ounces of water (0% solution).
{{{0(X)+10(68)=(X+10)(20)}}}
{{{680=20X+200}}}
{{{20X=480}}}
{{{X=24}}}
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Add 24 ounces of water to make a 68% solution into a 20% solution.