Length of a rectangle is twice its width. Perimeter is $36$ m. Length is

Length of a rectangle is twice its width. Perimeter is $36$ m. Length is
  1. $12$ m
  2. $6$ m
  3. $18$ m
  4. $24$ m

Solution

$2(w + 2w) = 6w = 36 \Rightarrow w = 6$. Length $= 12$.

Asked in: IMO

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