DAY 53:

Today’s Challenge

From the numbers below, eliminate all square numbers, triangular numbers, multiples of 4 and factors of 70.

1  2  3  4  5  6  7  8  9  10  12  14  15  16  18  20  21  24  25

Which is the only number left remaining?

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 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?

Make 53 Challenge

Can you arrive at 53 by inserting 4, 4, 5 and 6 into the gaps on each line?

  •  (◯+◯)×◯+◯ = 53
  •  ◯²+◯×◯+◯ = 53
  •  ◯²×◯–(◯+◯) = 53

Answers can be found here.

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