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

Which letter of the alphabet has the most water?

Find the next number in the series below

21 32 54 87 131 ?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Find the next number in the series

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

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

I cannot talk, but I always reply when spoken to. What am I?