Question 1105681
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You have 3 answers to your question so far.  Let me comment....<br>
The first tutor ankor... gave a perfectly good algebraic solution, using the standard method.<br>
The third tutor Josgarithmetic solved the wrong problem, making a total of 3000 gallons of the 12% wine instead of using 3000 gallons of the 15% wine.<br>
The second tutor alan3354 encouraged you to use your common sense instead of blindly plunging into a formal mathematical solution.  Doesn't it make sense that, since the 12% you want is halfway between the 15% and the 9%, you need to use equal amounts?<br>
The methods of algebra are useful; you should learn them.  But don't forget that you can often solve problems by using your BRAIN to think logically.