Replace the question mark with the number below given a simple math problem.

If eleven plus two equals one, what does nine plus five equal?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Can you find the key in the picture below?

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.

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Find the next number in the series below

21 32 54 87 131 ?

If,

1 = 5 ,
2 = 25 ,
3 = 325 ,
4 = 4325

Then, 5 = ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?