Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

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?

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

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Out of three Friends John, Jacob and Jonny one of them is a king, one is a bureaucrat, and one is a Spy.

The king always tells the truth, the bureaucrat always lies, and the Spy can either lie or tell the truth.

John says: Jonny is a bureaucrat
Jacob says: John is a king
Jonny says: I am a Spy

Tell me, Who is the king, who is the bureaucrat, and who is the Spy?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

I’m tall when I’m young, and I’m short when I’m old. What am I?

81 x 9 = 801. What must you do to make the this equation true?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

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