How do I work out the total circuit Current?
"i dont know how to change the diode Which has a 0.6V drop into ohms so i can complete the formula."


You don't need to do that.

Approach the problem as follows (with i being notation for current):

20v = drop across D1 + drop across R1 + drop across D2 + drop across R2
20v = 0.6v + r1*i + 0.6v + r2*i
18.8v = r1*i + r2*i
18.8v = (r1 + r2) * i

Can you now complete the problem using Ohm's laws?