I am white when I am dirty, and black when I am clean. What am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

I can be cracked, made, told, and played. What am I?

What has one letter and starts with an E?

Prove that the below maths equation is true.

8 + 8 = 91

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What is next number in the pattern below:

131 517 192 123 ?

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?