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

What can you deduce from the following BrainBat?

CRY
LMKI

What does this rebus means ?

PROG WORKRESS

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

How many triangles can you count in the figure given?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

What number should come in place of the question mark below?