Solution - Simplification or other simple results

Step  1  :

             3
 Simplify   ——
            13

Equation at the end of step  1  :

    5    4     3
  (—— • ——) • ——
   15   14    13

Step  2  :

            2
 Simplify   —
            7

Equation at the end of step  2  :

    5   2     3
  (—— • —) • ——
   15   7    13

Step  3  :

            1
 Simplify   —
            3

Equation at the end of step  3  :

   1   2     3
  (— • —) • ——
   3   7    13

Step  4  :

Final result :

   2           
  —— = 0.02198 
  91