How many times can you subtract the number 5 from 25?

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 ?

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?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Why Aeroplane windows are round?

Can you place three balls such that the equation shown in the picture holds true?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

I can write cow in 13 letters.

Can You?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?