I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

If 1+9+8=1, what is 2+8+9?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

What can you hold in your right hand, but never in your left hand?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?