Hi,



width of a flat screen monitor is 4 times it's height

Let x and 4x represent the height and width respectively

Question states***

 2*4x + 2*x = 120cm

     10x = 120cm

       x = 12cm, the height.  The width is 48cm



CHECKING our Answer***

 2*12cm + 2*48cm = 24cm + 96cm = 120cm 

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