You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What word begins and ends with an E, but has only one letter?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

There are forty elephants and they have forty-fore heads. How can this be possible?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Prove that twice of ten is the same as twice of eleven.