Explanation:
the info about renting skis is just to confuse us and has no impact on the answer.
a daily pass costs $62
the season pass costs $400.
we know the answer about how many days, when we find his often the daily pass price fits into the season pass price :
400 / 62 = 6.451612903...
that means 6 daily ski passes cost still less than the season pass.
but when buying 7 daily passes, then we pay more than the season pass.
therefore, only after 7 days (or more) of skiing is the season pass less expensive.