RX: Potassium Chloride 3:4 solution 30 ml. How many ml of potassium 1:20 solution and 4:5 solution do you need to prepare the order?

RX: Potassium Chloride 3:4 solution 30 ml. 

How many ml of potassium 1:20 solution and 4:5 solution do you need to prepare the order?   Please show your work and formula you used, I would greatly appreciate it.     

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