Question 1175706
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The METHOD used by tutor @josgarithmetic is the fastest and easiest method for solving 2-part mixture problems like this.<br>
However, the conclusion he draws from his calculations is not correct.<br>
The fast and easy solution using his method is this:<br>
45% is 1/4 of the way from 40% to 60%;
therefore 1/4 of the mixture is the 60% alcohol.<br>
ANSWER: 1/4 of the 12 liters, or 3 liters, is the 60% alcohol; the other 3/4 of the mixture, or 9 liters, is the 40% alcohol.<br>