Solution - Simplification or other simple results

Step  1  :

            1
 Simplify   —
            5

Equation at the end of step  1  :

  1   1
  — • —
  3   5

Step  2  :

            1
 Simplify   —
            3

Equation at the end of step  2  :

  1   1
  — • —
  3   5

Step  3  :

Final result :

   1           
  —— = 0.06667 
  15