Question 1098393
<br>Again to tutor ikleyn...<br>
In response to another similar problem, you scolded tutor amalm06 for using a method that you did not understand, saying that students will not understand what they are doing if they use that method.<br>
Yet here in your response to this question, you say the way to start the problem is with the "concentration" equation.<br>
That might be where you would start, probably because of your background in science.  But to a beginning student, that is a "magic" formula, the basis of which is not clear.<br>
If you want to advocate using problem solving methods that are easy to understand, then starting working on this problem with a magic formula is not a good way to go.<br>
The standard algebraic approach to the problem is a much better place to start for beginning students. Tutor amalm06 posted a very neat and concise solution for this problem that requires far less work than your method.<br>
And, as I stated in my other recent comment to you, the method of alligation is the most efficient method for solving a problem like this, requiring far less work than the solution you show.