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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
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.
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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?
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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
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May 15th, 2012, 10:01 AM   #4
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Presumably, BAC means "blood alcohol concentration".
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