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June 3rd, 2015, 11:15 AM  #1 
Newbie Joined: Jun 2015 From: Daventry Posts: 3 Thanks: 0 Math Focus: Drug calculations  Drug calculation
I am sorry I didn't know where to put this. Anyway, Hello everyone, I have an exam on Monday. I printed out some papers my uni have provided. I'm not allowed a calculator. Now I know how to work it out, I didn't know if someone could share an easier way of working this out. Rev Green is prescribed medication D. The protocol advises that the minimum concentration of the solution should be 750mg in 150mls. Using this calculation what is the minimum amount of fluid you would need to give 1g of medication D? I'm doing as, 1000 750 = 1.3333333333 Ã—150= 200ml, This one question has taken me 30mins and the exam is 30mins in total. Any suggestions would be grateful, I think my brain is dead from working on drug calculations all day, what you want Ã— volume it is in what you have Thank you Jacqueline 
June 3rd, 2015, 12:33 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,923 Thanks: 1122 Math Focus: Elementary mathematics and beyond 
Your reasoning and your result are correct.

June 3rd, 2015, 12:38 PM  #3 
Newbie Joined: Jun 2015 From: Daventry Posts: 3 Thanks: 0 Math Focus: Drug calculations 
Cheers, I thought so, I just didn't know if their was an easier way of working it out My brain has stopped working í ½í¸© 
June 3rd, 2015, 01:23 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,370 Thanks: 2007 
As 1000/750 can be evaluated instantly as 4/3, it remains to calculate 4/3 of 150 ml, which can be done very quickly to obtain 200 ml. Using an electronic calculator for this would also work, but would take longer than mental arithmetic. More important, however, is recognition of the nature of the problem. Go back over how it was tackled to see why it took so long, then, hopefully, the next problem of this type can be completed within half a minute instead of half an hour. 
June 3rd, 2015, 01:33 PM  #5 
Newbie Joined: Jun 2015 From: Daventry Posts: 3 Thanks: 0 Math Focus: Drug calculations 
Yay, you are a legend. I didn't think of it like that, thank you so much


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