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

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Why Wine Glass Stem is so long?

What is always in front of you but can’t be seen?

When we see 2 but call 10?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Solve the puzzle by telling what does below picture means.

What is the coolest letter in the alphabet?