13 +40 = 53.
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40
8/40 + 5/40 = 13/40
Area = Length*Width so Width = Area/Length = 40/[10+sqrt(13)] = 40*[10-sqrt(13)] / [10+sqrt(13)][10-sqrt(13)]= [400 - 40*sqrt(13)] / [100 - 13]= 400/87 - 40*sqrt(13)/87= 40/87*[10 - sqrt(13)]= 2.94 approx.
this equals 818
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260