By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

If you say my name, I will no longer exist. What am I?

Solve this riddle by finding the odd one out from the rest.

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Replace the question mark with the number below given a simple math problem.

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?