perplexus.info :: Logic : Beginning of the Month

Beginning of the Month (Posted on 2017-01-09)

In a particular year there were exactly four Mondays in January as well as exactly four Fridays that month. What day of the week was January 1?

Submitted by Charlie

Rating: 5.0000 (1 votes)

Solution: (Hide)

The days of the week of January 1, 2 and 3, each occur five times in that month. Friday to Monday leaves only two days in between, so the three 5-occurrence days must be Tuesday, Wednesday and Thursday.
The 1st was on a Tuesday.

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Subject	Author	Date
Answer	Math Man	2017-01-15 09:56:00
Solution	Jer	2017-01-09 13:41:41

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