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.

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

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

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Can you find the missing piece of the Porsche?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I don't get anymore wetter, no matter how much rain falls on me.

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

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?