Question 417959
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Hi
Let x, x/2, (x-8), represent the sides
Question states***
  x + x/2 + (x-8) = 42m
Solving for x
5/2x = 50m
       x = 20m   x/2 = 10m  and (x-8)= 12m
Length of sides are: 10m,12m,20m

 CHECKING our Answer***
  20m + 10m + 12m = 42m