Question 1127812
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(total amount of alcohol) divided by (total amount of solution), converted to a percent.<br>
The amount of alcohol is 20% of the 5 gallons, plus 30% of the 3 gallons, plus 100% of the 2 gallons.  The amount of solution is 5 gallons plus 3 gallons plus 2 gallons.<br>
{{{((.20)(5)+.30(3)+1(2))/(5+3+2) = 3.9/10 = 39/100}}} = 39%