what does the below rebus means?

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

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?

What number when divided in half becomes zero?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

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Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

I have branches, but no fruit, trunk or leaves. What am I?

What does it mean?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Find the number of squares in the below picture