DAY 116

Today’s Challenge

All of the following 3-digit numbers are divisible by 3, but only one is a multiple of 9. Which one is it?

237    276    303    336    495    528    582    660    744    771    888    939

[Note: If you don’t know the trick on how to find this out quickly, please get in touch.]

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The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 5th & 6th rows of the playing board contain the following fourteen numbers:

5     6     7     12     16     18     20     21     33     49     50     56     81     84

What is the difference between the highest and lowest multiples of 7?

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Answers

. . . can be found when clicking this.

7puzzleblog

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