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

The Little ant seems to be always confused. Do you know why?

Can you start the fire using two pieces of wood?

Count the number of triangles in the given picture.

It belongs to you, but other people use it more than you do. What is it?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

What is the word or phrase?