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Eight of us go fourth, not back, to protect our king from an attack. What are we?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

What does it mean?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Why do you find that most of the buildings are deprived of the 13th floor?

Prove that twice of ten is the same as twice of eleven.