The pharmacist wants to make you crazy. He combines some of the content from 3 bags: Bag A contains 13 mg of medication in a 100 ml 0.45%Nacl. Bag B contains 110 mg of medication in 500ml. Bag C...

The pharmacist wants to make you crazy. He combines some of the content from 3 bags: Bag A contains 13 mg of medication in a 100 ml 0.45%Nacl. Bag B contains 110 mg of medication in 500ml. Bag C contains 24 mg of medication in a 250 ml bag. He makes a new bag (Bag X) that contains 50% of bag A, 75% of bag B, and 25% of bag C. If you wanted to give the patient 45 mg from Bag X, how many ml would the patient need? Round to a whole number.

how did the come up with a 231ml answer thank you