DAY 41:

Today’s Challenge

When a certain 4-digit number is multiplied by 4, its digits appear in reverse order. It also has both of the following properties:

  •  its first digit is a quarter of the last one, and
  •  its second digit is one less than the first.

What number must it be?


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 & 6th rows of the playing board contain the following fourteen numbers:

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

List four pairs of numbers that have a difference of 7.



. . . can be found when clicking this.


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