Why is 6 afraid of 7?

Which is the rope you never skip with?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

Replace the question mark with the correct number in the below-given picture?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Forwards I am heavy, backward I am not. What am I?

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.