May 15th, 2012, 01:49 AM  #1 
Newbie Joined: May 2012 Posts: 8 Thanks: 0  Formula help
I've got this equation for blood alcohol content, and I need to find the BAC at certain times. BAC equation: B = (A/rW) * 100  V t B where B = Bac, A is amount of alcohol in grams, r = 0.7, W is mass in grams, V is 0.015 and t is time since drinking. I have to find bac with mass 75000 grams (75kgs), 50 grams of alcohol after 5 hours. I subbed it all in and the answer is 0.02, which is fine. My question is, I need to find how long will it take for the BAC to be below 0.05 in the above question. Is revision question, so please help me! Thank you. 
May 15th, 2012, 01:50 AM  #2 
Newbie Joined: May 2012 Posts: 8 Thanks: 0  Re: Formula help
Would it just be setting b = 0.05 and solving for t? I tried that and got 2.4 is that the right answer? 
May 15th, 2012, 05:56 AM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038  Re: Formula help
Lordy, lordy...can you post your problem again, paying attention to Capitals and lowercase; like, A and a would be 2 DIFFERENT variables 
May 15th, 2012, 10:01 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,937 Thanks: 2210 
Presumably, BAC means "blood alcohol concentration".


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