Today’s Challenge
From the numbers 1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 25, eliminate:
- square numbers
- triangular numbers
- multiples of 4
- factors of 70.
Which is the one number that is left remaining?
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The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84.
The 1st & 5th rows contain the following fourteen numbers:
2 6 7 9 14 15 16 21 22 40 50 72 81 84
What is the difference between the lowest and highest multiples of 5?
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Answers
. . . can be found when clicking this.
