Question 1158867
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The amount of salt is 12% of 80 pounds, which is 9.6 pounds.<br>
You want those 9.6 pounds to be 20% of the final solution:<br>
{{{9.6 = .20(x)}}}
{{{x = 9.6/.20 = 48}}}<br>
The final solution needs to be 48 pounds; it originally was 80 pounds, so 32 pounds of water needs to be evaporated.<br>