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If you write out the numbers from 1 through 20 (including 1 and 20), how many of the numbers have a "5" in them?
 

 Mar 20, 2021
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You can either write them out which and count them up, which takes 20 seconds, or use your brain and realise that it's only 5 and 15, fo your answers is 2, both of which take less time to do than ask on this forum and waste people's time.

 Mar 20, 2021

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