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 high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

How is the moon similar to a dollar?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

When is the top of a mountain similar to a savings account?