# Pharmacy mixture math

by may
(louisiana)

The order is 120mg.The oral liquid dosage strength is 100mg/5ml.Calculate the ml to be given for this dosage. Round answer to the nearest tenth

### Comments for Pharmacy mixture math

 this looks like a dosage calculation by: Anonymous 6ml

 Please help by: Kia you would multiply 120mg by 5ml giving 600 mg/ml dividing that by 100 MG will cancel out the MG leaving 6 ML

 hmmm.. by: Anonymous I have trouble setting up the formula...I understand what I have to do it's just applying it. I got 5.4 but I understand why its 6ml

 explanation by: Anonymous These problems always have three parts: the given, the units of the answer and one or more ratios. In this case the given is 120mg, the units of the answer are mL and the ratio is 100mg/5 mL. The ratios always equal 1, so you are just multiplying 120 mg by a form or 1 to change it from mg to mL. Also, the ratios can always be flipped upside down when needed.120mg (5 mL/100mg) = 6 mL. The units of mg cancel out and you are left with mL. The reason that 100mg/5 mL = 1 is because in this case 5 mL = 100mg and anything divided by itself or an equal value = 1.

 calculations by: Anonymous always put your known factors on the left in this case you would put 120 mgs and put 100 mgs under it on the left side on the right side you would put 5 ml across from the 100 mgs on the right on the right top you would put x then multiply 120x5 equals 600 then divide 100 into six and it is 6 ml

 answer by: Anonymous [100] 120----- = ----- 5. X. 100x=600 ---- --- 100. 100 X= 6