Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

O_er_t_o_

Complete the missing letters of the given word.

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

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

What is more useful when it is broken?

How is a fly different from a mosquito?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

What seven-letter word has hundreds of letters in it?