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May 15th, 2012, 01:49 AM   #1
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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

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.
LordRaaa is offline  
May 15th, 2012, 01:50 AM   #2
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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?
LordRaaa is offline  
May 15th, 2012, 05:56 AM   #3
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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
Denis is offline  
May 15th, 2012, 10:01 AM   #4
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Presumably, BAC means "blood alcohol concentration".
skipjack is offline  

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