There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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

Can you find the 09 errors in the picture below?

Which tank will fill first?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

One evening there was a murder in the home of a married couple, their son and daughter. One of these four people murdered one of the others. One of the members of the family witnessed the crime.

The other one helped the murderer.

These are the things we know for sure:

1. The witness and the one who helped the murderer were not of the same sex.

2. The oldest person and the witness were not of the same sex.

3. The youngest person and the victim were not of the same sex.

4. The one who helped the murderer was older than the victim.

5. The father was the oldest member of the family.

6. The murderer was not the youngest member of the family.

Who was the murderer?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you solve below mathematical equation?

2^1234 - 2^1233

Find the number of squares in the below picture