Another question

sorry, that was incorrect. Is there a way to do this problem?

Edit: Nevertheless, I realized I made a calculation mistake, and I had found that the answer is a=12

please include your working so that others can also learn.  

I didn't use an algebraic way, but I used a base change calculator, so essentially guess and check.

However I knew that the base had to be above 11, since B is not included in the Base 11 digits. 

Here's a good tool: http://www.unitconversion.org/unit_converter/numbers-ex.html

Thanks OP

I like the calculator that you have found

I have added your calculator to our "reference material post."

This can be found at the end of the  "Sticky Topics" list on the right of the web2 site.

oh! and forgot to mention: For that tool link, there's a number conversion table, so you can compare all bases up to base 36. 

http://www.unitconversion.org/unit_converter/numbers-ex.html