I make two people out of one. What am I?

What brings you down but never up?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

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

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

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?

Take one out and scratch my head, I am now black but once was red. What am I?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.