100/5 = 20
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34 if you count 100, 33 if you don't.
10,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91 18 numbers, 20 if you count 1 and 100.
Write out the numbers 1 to 100. Count the number of times 1 appears.
If you count 40 and 100, there's 61. 100-40+1=61
Every second number is Even. So there are 50 even numbers from 1 to 100 if you include 100. If you do not include 100 in the count there are obviously 49. The wording of the question is not clear on whether 100 is to be included or not.