Solution - Simplification or other simple results

Step  1  :

            1
 Simplify   —
            6

Equation at the end of step  1  :

  180   1
  ——— • —
   3    6

Step  2  :

            60
 Simplify   ——
            1 

Equation at the end of step  2  :

       1
  60 • —
       6

Step  3  :

Final result :

  10