DAY 255:

Today’s Challenge

Here’s a 2-part, 7-step number trail involving all four arithmetical operations.

Part 1: When starting with the number 15, what is your final answer?

  • 1
  • +2
  • ×3
  • ÷4
  • +5
  • 6
  • ×7

Part 2: What must your starting number have been if, when using the seven arithmetical steps above, your final answer was 3.5?

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 2nd & 6th rows contain the following fourteen numbers:

5    8    12    17    18    20    28    33    48    49    55    56    63    64

Which number, when 11 is added to it, becomes a square number?

Make 255 Challenge

Can you arrive at 255 by inserting 2, 4, 5, 6 and 10 into the gaps on each line?

  •  (◯×◯+◯÷◯)×◯ = 255
  •  (◯×◯)²–(◯+◯)²–(7–◯)² = 255

Answers can be found here.

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