If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

In a secret society, a buried chamber can be accessed only via a secret password. The password is seven characters long and comprises of just letters and numbers.

You find a code that can help you in cracking the password. The code says "You force heaven to be empty".

Can you deduce the password from that?

Can you write down eight eights so that they add up to one thousand?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Which Burger Is Different in below image?

I know a nine-letter word having only one vowel.
Do you ?

Which tank will fill first?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?