How to weigh a jet plane without a balance?

In job interviews, Microsoft often asks some interesting questions to test the intelligence, imagination and problem-solving ability of candidates. The question you asked is a strange question in Microsoft recruitment interview. The book The Secret of Microsoft Draft answers this question.

Some applicants suggested going to Boeing's website to check the specific specifications of this plane, and you will know the weight of this plane. But what can they do if the examiner doesn't allow it? Aren't you allowed to use the internet? No. The traditional version of this question requires you to weigh an elephant without a platform scale. No matter the plane or the elephant, you are not allowed to unload them into small pieces that are easy to weigh.

The answer is: you can hire someone to transport or fly the plane to an aircraft carrier, ferry or ship, as long as it is big enough to put it down, and then mark the waterline on the hull at this time. Then take the plane away and the boat will float again.

Now, we will start loading some items with known weight (anything is ok, such as 90 kilograms of cotton per package) on the ship until the ship sinks into the place where the sign has just been drawn. At this point, the total weight of the cargo is the total weight of the aircraft.

Of course, if you are a math fan, you can also use the following methods: calculate the volume of the ship between two water levels, multiply it by the density of water, and you can also get the weight of the plane.