81 x 9 = 801. What must you do to make the this equation true?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Can you find out the total number of triangles in the given figure?

Which flower has two lips?