DAY 137

Today’s Challenge

It is possible to use seven 5’s (5, 5, 5, 5, 5, 5 and 5) once each, with the four operations + – × ÷, to make all the target numbers from 1 to 5.

For instance, to arrive at the target numbers 1 and 2, you can do:

  • [(5+5)÷5 – (5÷5)] × (5÷5) = 1
  • [(5+5)÷5 – (5÷5)] + (5÷5) = 2

Your task is to show how to arrive at the other target numbers 3, 4 and 5.

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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 & 7th rows of the playing board contain the following fourteen numbers:

4     6     7     11     16     21     24     27     30     50     70     77     81     84

What is the difference between the two prime numbers?

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Answers

. . . can be found when clicking this.

7puzzleblog

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