By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What kind of storm is always in a rush?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

Find the next number in the series.
1 10 24 43 67 ?

Can you count the number of squares in the given picture?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Can you replace the question mark with the correct number?