DAY 311

Today’s Challenge

Try the following MATHELONA challenge, further details of my popular number puzzle can be found by clicking on this MATHELONA link.

Can you make all four lines work out arithmetically by replacing the 16 ◯’s below with digits 0-9?  Each digit can only be inserted a maximum of TWICE:

◯  +  ◯   =    9    =   ◯  +  ◯
◯  +  ◯   =    9    =   ◯  –  ◯
◯  +  ◯   =    9    =   ◯  ×  ◯
◯  +  ◯   =    7    =   ◯  ÷  ◯

[Note:  Try and complete without repeating the same sum when making 9.]

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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 2 up to 84.

The 2nd & 5th rows of the playing board contain the following fourteen numbers:

6     7     8     16     17     21     28     48     50     55     63     64     81     84

How many factors of 48 are there?

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Answers

. . . can be found when clicking this.

7puzzleblog

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