Let L be the length and W be the width of the rectangle.

Hence L = 4* W

We now use the area to write 80 = L * W

Substitute L by 4 W in the equation above 80 = 4*W × W = 4 W^2

Solve for W and find L

4 W^2 = 100

W^2 = 25, W = 5 and

L = 4*5 = <<4*5=20>>20 m

# Answer

20
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The length of a rectangle is four times its width. If the area is 100 m2. what is the length of the rectangle?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
20
The length of a rectangle is four times its width. If the area is 100 m2. what is the length of the rectangle?
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