The numbers 1, 2, 3, 4, 5, 6, 7 and 8 were in a row but untidy, when one of them said:
I am worth half of what the digits that I have ahead add up and a third of what the ones behind me add.
Who said it?
He had to say the number 6. In front were: 1 + 2 + 4 + 5 that add 12, and behind: 3 + 7 + 8, which add 18.
(The solution is always 6 although it is possible to combine the other values in different ways so that they can appear in front of or behind the 6)