Now an entry into Fortnightly Topic Challenge #41: Short and Sweet
A man enters a room and presses a button. Within seconds he loses 20 lbs body weight. How did he lose the weight?
The man previously lost 20lbs and without knowing this he came to check his weight on a weight machine and pressed button to check his weight apparently in seconds the result popped up showing he lost 20lbs, looks very natural and correct answer ! dont ask me exactly how he lost 20 lbs :-)
It was an air lock of a submarine and filled the chamber with water, the buoyancy reduces his weight by 20 lbs.
The button published a new law that vital organs are owned by the government rather than the individual. He is no longer the legal owner of that weight.
The man was head of the International Committee for Weights and Measures and the button was publishing a new heavier definition of the pound.
My first thought was:
He entered an elevator and pushed a button, causing the elevator to go down. The acceleration downwards is credited with making the man 20 pounds lighter, if only for a brief moment.
Then I thought of this:
If "lbs" stands for British pounds, then the man could have been at a gambling casino. He could have bet twenty pounds on red in a game of electronic roulette. When he pushed a button, the roulette ball landed on black, causing the man to lose his 20 pounds.
Thinking about it some more, I thought:
If the twenty pounds are truly weight, then the man could have simply been separated from something on his person. This could be an arm or a leg (separated by, oh, let's say a button-activated-spring-loaded-sawblade), or just something he was carrying. Maybe he was a delivery man delivering a 20 lb. package that was ordered on-line. He rings the doorbell, then within seconds a spring-loaded-saw... I mean, a grateful customer takes the 20 lb. package from the delivery man.
But then I thought some more, and I came up with:
Maybe he bought a collection of Richard Simmons' "Sweatin' to the Oldies" videos (I've seen some for around that price). I can't really explain how he'd lose so much weight "within seconds," unless I reinterpret "seconds" to mean "going back for seconds" (often heard when eating a meal). Maybe he liked the videos so much, he exercised a second time, or managed to lose enough weight despite having more portions of food.
The man traveled to another planet where the gravity is less than his spacecraft. he opened the door of spacecraft and loss 20lbs of his weight. (assuming he created the room to adjust the gravity of that planet)
the man was using jetpack when he pressed the button he lost 20 lbs of his weight. ( he was trying to practice to use jetpack inside the big room of enough space and it can also be water jet)
man was a pilot when his plane takeoff he lost 20lbs of weight. ( he may enter the pilot room and press the take-off button and lose 20lbs weight )
man was carrying something attached to him with an electronic device when he pressed the button he lost 20lbs of weight because the luggage dropped.
type answer. You say that the man loses 20 lbs of body weight within seconds - but
you don't say how many seconds.
It could be
several billion seconds
or even just
7,776,000 seconds, which is three months.
Consequently, the button was
The doorbell in the lobby of his gym. (He goes to a very high-end gym.)
It's quite reasonable to lose 20 lbs of body weight
in three months of working out (and eating right). The first step was ringing the bell.
He enters lift, presses the button downwards. Psuedo acceleration upwards works here against gravity and weight measured is less now.
Let M be his mass and mg be weight before (outside lift)
Losing 20 lbs-
Pseudo acceleration is (Mg-20)/M unit length per square unit time