Hi,

In an isosceles triangle, a leg is 3 more than 1/3 of the base "x"

Question states***

2(x/3 + 3) + x = 31

Solving for x

 

  

         x = 15, the length of each of the side is (15/3 +3) = 

CHECKING our Answer***

 8 + 8 + 15 = 31 

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