Question 1101792
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The solution by the other tutor is exactly right -- and it uses the BEST and EASIEST method there is for solving mixture problems -- the method of alligation.<br>
The calculations as he shows them look complicated, so let me show you a quick way of thinking of what those calculations are doing.  If you can think of mixture problems this way, you will solve them very quickly and with little effort.<br<
So here is how to think of this specific problem:<br>
"41 is 2/3 of the way from 39 to 42; therefore 2/3 of the mixture must be the 42% solution"<br>
That one piece of logical analysis takes care of 90% of the work in solving the problem; from there the rest is easy.  The amount of 42% solution is 2/3 of the total 24 liters, or 16 liters; the rest -- 1/3 of 24 liters, or 8 liters -- is the 39% solution.