Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

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 is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What is full of holes but still holds water?

Can you move two match sticks to make it 430?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?