"Did we able to solve your problems?"
"Were we able to solve your problems?"
Here "Did" and "Were" have replaced each other, do they both say and mean the same?
The first sentence is incorrect. It should be:
"Did we solve your problems"
"Were we able to solve your problems" is correct though.
Good reference (albeit old) BBC page: http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv196.shtml
You can't use "did" because the standard structure is "be able to do something". So, according to your subject, the verb "be" changes as well.