Complete the table series riddle by finding the number that can replace "??".

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Find the missing number in the sequence below:

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

Why despite killing dozens of people Charley and Wilma were not punished?

What does this Rebus Picture mean?