I can write cow in 13 letters.

Can You?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Can you count the number of quadrilaterals in the picture below?

You can see it everyday, But cannot touch it at will. What is it?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

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

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Why do we preferably have round manhole covers and not square ones?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.