The sixes you will pass are at:
6 16 26 36 46 56 60 61 62 63 64 65 66 67 68 69 76 86 96
This is a total of 20 digit sixes.
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20
You have to find out how many 6s go into 100 evenly so 100/6=16 with a remainder of 4 so you will pass by 16 6s
20
you would pass ten on the way.
20 remember to include 60, 61, 62, 63, 64, 65, 66 ........