Online Course Discussion Forum

Any tips on doing "how many numbers satisfy the following conditions" problems?

 
 
Picture of Dr. Kevin Wang
Re: Any tips on doing "how many numbers satisfy the following conditions" problems?
by Dr. Kevin Wang - Sunday, November 13, 2022, 12:50 PM
 

This question is pretty broad.  Lots of problems have different ways of handling and it would be different.  For the particular question, this year's AMC 10A #17, if you set up the equation, there should be no doubt about the answer.  Watch my video of the full solutions.