Using Only Five 5's and any mathematical operator make sum as 37

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?

Which of the below owl is odd one out?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

If your uncle’s sister is not your aunt, what relation is she to you?

Why is a river so rich ?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.