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

 
 
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Re: Any tips on doing "how many numbers satisfy the following conditions" problems?
WangDr. Kevin - 2022年11月13日 Sunday 12:50
 

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.