DAY 155:

Today’s Challenge

Can you arrive at the target number 81 by using the five numbers 1, 2, 3, 4 and 5 exactly once each, and with + – ×  ÷ available?

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

List three pairs of numbers with a difference of 9.

Answers can be found here.

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

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