Beer

After three 10° beers consumed in a short time, there is 5.6 g of alcohol in 6 kg adult human blood. How much is it per mille?

Correct result:

p =  0.9 ‰

Solution:

$$\begin{gathered} m_1=5.6\text{ g}\to \text{ kg}=5.6\mathrm{/}1000\text{ kg}=0.0056\text{ kg } \\ {m}_2=6\text{ kg } \\ p=1000\cdot {\displaystyle \frac{m_1}{m_2}}=1000\cdot {\displaystyle \frac{0.0056}{6}}={\displaystyle \frac{14}{15}}=0.9\text{ ‰} \end{gathered}$$

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