DAY 169

Today’s Challenge

Three unique digits from 1-9 must be used in a particular way to arrive at a specified target number – by multiplying two of the numbers together, and then either adding or subtracting the third unique number to arrive at your target.

By using the formula (a×b)±c, where a b and c are three unique digits from 1-9, one way of arriving at 18 is (5×4)2.  Find the FOUR other ways it is possible to make 18.

[Note:  (5×4)–2 = 18 and (4×5)2 = 18 counts as just ONE way.]

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The 7puzzle Challenge

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

The 2nd & 7th rows contain the following fourteen numbers:

4     8     11     17     24     27     28     30     48     55     63     64     70     77

Which number above 20 becomes a multiple of 11 when 20 is subtracted from it?

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Answers

. . . can be found when clicking this.

7puzzleblog

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