You can’t solve every problem you are given.  Infact, it is as good to be clear on the problems you can’t solve as it is the problems you can.  For those problems you can’t solve can you think of somebody who is better placed to solve it than you? 

Even if you do think you can solve a problem try and think if there is anyone better placed to solve it than you? Some may call this delegation: you might like to think of it as efficient problem solving.