Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

Can you place three balls such that the equation shown in the picture holds true?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).