I’m tall when I’m young, and I’m short when I’m old. What am I?

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

Find the next number in the sequence

1, 2, 6, 21, 88, __?

What is the fastest way to double your money?

Which is faster, Heat or Cold ? Explain.

I have no life, but I can die. What am I?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

Can you find out who is the kidnapper in below Picture and why, Explain ?

Remove two matchsticks to make the below equation correct.