DAY 21:

Today’s Challenge

Which is the lowest whole number that is not a multiple of 4, 5 or 6, nor a prime number, square number or cube number?

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 2nd & 4th rows of the playing board contain the following fourteen numbers:

3   8   10   17   28   32   35   44   48   54   55   60   63   64

Which odd number, when 1 is subtracted from it, becomes a prime number?

Make 21 Challenge

Can you arrive at 21 by inserting 3, 4, 5 and 6 into the gaps on each line?

  •  (◯+◯–◯)×◯ = 21
  •  ◯×◯+(◯+◯) = 21
  •  ◯²–(◯×◯÷◯)² = 21

Answers can be found here.

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