# Finding the mass of bed/Patient [closed]

One of my friends has a problem and we don't know how to get this done,

We want to to know the mass of a patient who is laying on a bed. One scales was put under the foot of a bed and weighed 232kg and the other under the head of the bed and weighed 220kg. The centre mass of the patient is 0.8 meters from the foot of the bed. What is the mass of the patient?

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## closed as off-topic by ACuriousMind, Ali, Kyle Kanos, Danu, John RennieSep 6 '14 at 14:21

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The problem is formulated very oddly. "under the foot of the bed". A bed usually has four of them. Next: " under the head", what is that? One of the posts at the head end? What about the other posts when one is on the scale? Does one of the other posts "float" ? – Georg Mar 7 '11 at 10:49
@Georg: i have reworded the question. – omeid Mar 7 '11 at 12:08
Still not clear: are those scales under the posts at the same time or in consecution? And are they placed under posts on the same side of the bed or diametrally? What about symmetry of bed/patient? – Georg Mar 7 '11 at 12:35
Constitutive and diametrically. – omeid Mar 8 '11 at 8:44
I just tried to look up the same question- it's from a study course for the GAMSAT (medicine exam) The second half of this video explains it- khanacademy.org/science/physics/torque-angular-momentum/… – user58616 Sep 6 '14 at 2:47