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: 14,347 Thanks: 1024  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: 20,485 Thanks: 2041 
Presumably, BAC means "blood alcohol concentration".


Tags 
formula 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Formula Help  NuNu_dagobah  Computer Science  4  January 8th, 2013 07:31 AM 
My new formula for pi(x)  nsrmsm  Number Theory  7  October 15th, 2012 05:36 AM 
why we use this formula  rsoy  Physics  3  December 23rd, 2010 08:54 PM 
Formula to always get 28  djx18  Algebra  1  September 20th, 2009 05:25 PM 
De Moivre's formula and Newton's binomial formula  agro  Probability and Statistics  3  August 27th, 2009 06:17 AM 