Which word does the below Plexor means ?

I add 5 to 9 and get 2. The answer is correct, so what am I?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

Can you divide the below-given shape into four equal and identical pieces?

There was a strange boy who was born before his father. How can this be possible?

What has 88 keys?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?