The answer is 20.
6, 16, 26, 36, 46, 56,60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 76,86, 96. It is 20 because 66 is a double 6.
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20
20
you would pass ten on the way.
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 remember to include 60, 61, 62, 63, 64, 65, 66 ........