I have a question about DCski's slope statistics shown on each resort page. On Snowshoe's page it shows: 57 trails (14% beginner, 36% intermediate, 23% expert). That only adds up to 73% . . . what about the other 27% ??
Rule of 9: if the difference between the actual result and the true result digits add up to 9 (or a multiple of 9) then two consectutive digits have been transposed in one of the addends.