How many words can a pen with half refill write?

What do you see in the image below

Can you replace the question mark with the correct number?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

The more it dries, the wetter it becomes. Can you tell what it is?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Who are the happiest people in IPL match?