SOLUTION: How many numbers are there between 20 and 100 which are divisible by 5?

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Question 582297: How many numbers are there between 20 and 100 which are divisible by 5?
Answer by KMST(5328) About Me  (Show Source):
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20=5%2A4 so 20 is the 4th multiple of 5 (the first three being 5, 10, and 15)
100=5%2A20 so 100 is the 20th multiple of 5
In between are:
5%2A5=25, 5%2A6=30 and so on up to 5%2A19=95
If you count 20 and 100, there are 17 of the first 20 multiples of 5 between 20 and 100.
If 20 and 100 are not included, then there are 15.