A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?