DAY 131:

Today’s Challenge

Can you replace the 20 ◯’s below by using the numbers 0 to 9 exactly twice each so that all five lines work out arithmetically?

◯  +  ◯   =    15    =   ◯  +  ◯
◯  +  ◯   =     5     =   ◯  –  ◯
◯  +  ◯   =    10    =   ◯  ×  ◯
◯  –  ◯   =     2     =   ◯  ÷  ◯
◯  +  ◯   =     9     =   ◯  ×  ◯

If you enjoyed attacking this tricky puzzle, click this MATHELONA link for details of our slightly easier pocket book challenges.

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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 3rd & 6th rows of the playing board contain the following fourteen numbers:

5     12     13     18     20     25     33     36     42     45     49     56     66     80

What is the sum of the numbers in the forties?

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Answers

. . . can be found when clicking this.

7puzzleblog

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