What you cannot hold but it is yours?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

Our product and our sum always give the same answer. Who are we?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

A research team went to a village somewhere between the jungles of Africa. Luckily for them, they reached the day when quite an interesting custom was to be performed. The custom was performed once a year as they confirmed and was performed in order to collect the taxes from every male of the region.

The taxes were to be paid in the form of grains. Everyone must pay pounds of grain equaling his respective age. This means a 20-year-old will have to pay 20 pounds of grain and a 30-year-old will pay 30 pounds of grain and so on.

The chief who collects the tax has 7 weights and a large 2-pan scale to weigh. But there is another custom that the chief can weigh only three of the seven weights.

Can you find out the weights of the seven weights? Also, what is the maximum age of the man that can be weighed for the payment of taxes?

They are three errirs in this question. Can you find them?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

What is black when you buy it, red when you use it, and gray when you throw it away?

How many times in a given day, minutes and hour clock comes in a straight line ?

People put me on the table and cut me but do not eat me. What am I?