A woman lives in a skyscraper thirty-six floors high and is 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?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

Can you start the fire using two pieces of wood?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Find the next number in the sequence

5 12 24 36 ?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What goes up but never comes down?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?