Question 618096
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Hi,
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segment parallel to one side of the triangle forms Similar Triangles:
Corresponding sides of similar triangles are proportional.
 {{{y/20 = 10/25}}},  Cross Multiplying to solve
{{{y = 10*20/25}}}
  y = 8
 {{{(x+12)/12 = 20/8 =5/2 }}},  Cross Multiplying to solve 
     2x + 24 = 60
          2x = 36
        x = 18