Can you replace the question mark with the correct number?

Aman has 1.15 rupees in his pocket. There are a total of 6 coins in his pocket.

When his friend asked him for a change, he could not give change for a rupee and five paisa.

Can you tell which coins he has?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

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?

I am sure no one can have two things for dinner. what are they?

In which direction should the missing arrow point?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

What is the Surname of Barbie Doll?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?