Question 928866
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Hi,
     *[illustration rectangle.png].

2L + 2w = 20m
L + w = 10m
{{{L + L/4 = 10}}}} |Multiplying thru by 4 so as all denominators = 1
.....
4L + L = 40
5L = 40
L = 8m   and w = 2m {{{8/4}}}
And...checking
Sum = 10m