There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

What number divided by 4 is the same as that number minus 4?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

Who has married many women but was never married?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.