Online Course Discussion Forum

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

 
 
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Any tips on doing "how many numbers satisfy the following conditions" problems?
by Jialin Wang - Saturday, 12 November 2022, 11:13 PM
 

An example of this is this year's 10A #17. I got the right  answer but was still hesitant to choose the answer choice because I am worried about I am missing another.

II feel like it is easy to leave something out on these questions but I don't want to spend too much time checking on a single question either. Any tips on how to organize time on the test?

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