How can you write nineteen in a manner that if we take out one, it becomes twenty?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Whats the next number in the below number sequence pattern.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Why do people go to bed?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

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