Which Burger Is Different in below image?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

How many triangles can you count in the figure given?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Find the missing number in the image below.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?