1.1. January first of a certain non-leap year fell on a Saturday. And how many Fridays are there in this year?
Answer: 52

Solution. In a non-leap year, there are 365 days. The first two days fell on Saturday and Sunday, followed by 51 full weeks ( $51 \cdot 7=357$ days) and 6 more days. In total, there are 52 Fridays.