A merchant has 21 sacks of grain: 7 full, 7 half-full and 7 empty. He wants to divide them equally among his three sons. How can he do this, without transferring any grain between sacks, so each son has the same quantity of grain and number of sacks?
We know each son must end up with 7 sacks and 3.5 sacks of grain, since (7 sacks + 7 half sacks) / 3 = 3.5 sacks each.
Solution 1
Solution 2
We know each son must end up with 7 sacks and 3.5 sacks of grain, since (7 sacks + 7 half sacks) / 3 = 3.5 sacks each.
Solution 1
Solution 2
The numbers 3, 7, 8, 40, 50 and 60 all share something that no other whole number does. What is it?
When spelled out in English they each have exactly five letters.
When spelled out in English they each have exactly five letters.
What has a foot on each side and one in the middle?
A yard stick.
This Roman numeral equation is wrong, but you can fix it without changing any of the elements of the equation. How is this possible?
I + XI = X
Look at it upside down. Instead of changing the equation, you can change your perspective.
This is from Dan Brown’s novel, Origin.
Look at it upside down. Instead of changing the equation, you can change your perspective.
This is from Dan Brown’s novel, Origin.
What binds two people yet touches only one?
A wedding ring.
Whoever makes it, tells it not.
Counterfeit money or poison.
Counterfeit money or poison.
There is an abandoned aquarium in an empty house. The aquarium has three large fish and three small fish. But after a week, one large fish and two small fish die.
How many remain in the aquarium?
Six, since no one is there to remove the 3 dead fish.
Six, since no one is there to remove the 3 dead fish.
Little Miss Eticote
A candle.
What is dark as midnight but is still night?
Bedtime
Kings and queens may cling to power
An ace (in a deck of cards).
An ace (in a deck of cards).