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

Can you find out who is the kidnapper in below Picture and why, Explain ?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What brings you down but never up?

What does this simple rebus mean?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

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?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.