Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Give it food and it will live; give it water and it will die.

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

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

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?