DAY 153:

Today’s Challenge

Using the three numbers 4, 4 and 4 once each, with + – × ÷ available, there are just six target numbers from 1-30 that are mathematically possible to achieve.  Can you list them?

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 3rd & 7th rows contain the following fourteen numbers:

4    11    13    24    25    27    30    36    42    45    66    70    77    80

Which number above 20, when 15 is subtracted from it, becomes a multiple of 7?

Answers can be found here.

Click this link for details of online math tuition with me, Paul Godding.

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