"What do you do when you're having difficulty solving a problem?"

There are many different ways to approach this answer. So there are many right answers. Just remember to explain yourself step by step.

Short Answers

"I usually take a short break. I found that this helps me think clearer and often times I end up solving the problem."

"I break down the problem piece by piece and try and solve difficult problems step by step. This approach helps me not to get overwhelmed by difficult problems."

"I always do my best solving difficult problems. If I have trouble, I'll use resources around me such as looking through the Internet, asking co-workers, asking my manager, or looking through some books."

Long Answer

"There are couple things I do when I'm having a problem. Sometimes I try to focus so hard that I miss a point that would help me solve the problem. So I take a 2 minute break to help me approach the problem in a different way. I could either go get a drink of water, or stand up and move around. I find that this helps me at times. But if I still continue to have problems, I don't mind asking a co-worker for some assistance. I believe in using all the resources around me and I think co-workers should use me as a resource as well."

This answer first tries to solve the problem without bothering another person. But if everything fails, it is ok to ask questions to someone else.