9) Apple Cider

How can you measure one liter of apple cider out of a barrel, if all you have available is a 3-liter and a 5-liter pitcher?

8) Egg Salad

Farmer Tuttle has many hens. He knows that 20 of them, housed in three coops, will hatch 30 eggs in 18 days.

How long will it take for 30 hens, housed in four coops, to hatch the same number of eggs?

7) Identical Twins

Andrea and Bonnie are identical twins. Well, identical except for one thing: Andrea always tells lies, while Bonnie always tells the truth.

What question could you ask of the two of them in order to tell who is who?

6) Number Please

What is the smallest five-digit number in which the digit in the 10's place is twice the digit in the 1,000's place (and neither digit is zero)?

5) A Fair Split

A large cookie is to be divided between two children. They are both anxious to have the cutting done fairly so that the other doesn't end up with a bigger piece.

How can the children be sure that they have received a true half of the cookie?