Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Solve the mathematical equation in the picture below.

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

Before Mount Everest was discovered, what was the highest mountain in the world?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.