I first heard a variant of this puzzle back in school, that’s going back to the early 1980s. Lets see how many can solve it.
This is not as simple as you may think. It is good to let an ageing brain do some work.
Three men went to a hotel to share a room.
The clerk asked for $300.
Each man paid $100, making up the $300.
The hotelkeeper then decided to allow a discount for the day, charging only $250 for the room.
He told the clerk to return $50 to the three men.
The clerk pocketed $20 for himself. He gave the remaining $30 back to the three men.
Each man took back $10. Therefore, each man paid 100 – 10 = $90 to the hotel.
$90 x 3 = $270 + the clerk’s $20 = $290.
Question: Where has the remaining $10 gone?