montclairoptical montclairoptical

31-01-2018
Mathematics

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If a length of a rectangle is four times its width. What is its perimeter is 90m. How can i find the dimentions

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15edwardsa 15edwardsa

31-01-2018

imagine the width is x. So the length is 4x.
put the perimeter into an equation, so it would be
4x+4x+x+x=90m
10x=90
divide by 10
x=9
so the width = 9cm so the length is 36cm
36+36+9+9=90

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