John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

How is the moon similar to a dollar?

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.

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

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

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Decode this picture on T-Shirt and tell what it says ?

I cannot talk, but I always reply when spoken to. What am I?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Identify The phrase in the picture.