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 2 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.