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Answer to Question #21385 in Algebra for lara

Question #21385
wall paper,312 cm long and 25 cm wide is required to cover the walls of a room. length of the room is 7 m and its breadth is twice height.determine the height of the room.
Expert's answer
We assume, that room doesn't have any windows and doors.
For paper S=312*25
For walls S=2*(l+b)*h
l=700 sm
b=2h
2*(700+2h)h=312*25
4h^2+700h-7800=0
h^2+125h-1800=0
Hence, h=13 sm
So, we see, that input data are not right.
If we will take wall paper 3120 sm length, we get h=185 sm, that is normal result.

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