Mental Floss 153

The answer to last week’s challenge is: Q: How many times does the digit 3 appear between 1 and 50?

A: 15 times. 3, 13, 23, 30 31, 32, 33 (two 3’s), 34, 35, 36, 37, 38, 39 & 43.

This week’s challenge is:

Q: Two flexible wicks have been formed into torches. Each can burn exactly 60 minutes, but at a rate that is neither uniform nor predictable. How can you tell when 45 minutes have elapsed if you have nothing but matches at your disposal and no clock, ruler or scissors?

The answer along with a new challenge, next week.

Have an excellent weekend …

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