Problem solving

For the last couple of days I have been working on how to problem solve. The easy part about it was that I knew the answer to the problem and the hard part was trying to work it out because I struggled a bit and also my teacher was not interested in the answer she was interested of how I worked it out but once I read the problem twice I found away of how to work it out then I writ it in my book and showed her how I worked it out.