Replace the question mark with the correct number in below Picture:

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

Can you count the number of triangles inside a triangle?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

A monk has a very specific ritual for climbing up the steps to the temple. First, he climbs up to the middle step and meditates for 1 minute. Then he climbs up 8 steps and faces east until he hears a bird singing. Then he walks down 12 steps and picks up a pebble. He takes one step up and tosses the pebble over his left shoulder. Now, he walks up the remaining steps three at a time which only takes him 9 paces. How many steps are there?

What is black when you buy it, red when you use it, and gray when you throw it away?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

How many times can you subtract the number 5 from 25?

How can you make number one disappear by adding something to it?