Posts filed under ‘The Disappearing Dinar’

The Disappearing Dinar

A bill of 30 dinars is paid by the three men, each putting up 10 dinars. It turns out that there was an error; the bill was only 25 dinars. They get back 5 dinars; each takes 1 dinar, and the remaining 2 dinars are given to the slave who served them.
However, someone finds this strange, because now each has paid 9 dinars making a total of 27 dinars. Adding in the 2 dinars given to the slave only makes 29 dinars. How did 1 dinar disappear?

Mathematical excerpts from The Man Who Counted by Malba Tahan

September 12, 2010 at 3:42 pm 1 comment