Bracelet

The silver bracelet weighs 62g and contains 59g of silver. What is the purity of the bracelet?

Correct result:

r =  952 ‰

Solution:

$$\begin{gathered} m_1=59\text{ g } \\ {m}_2=62\text{ g } \\ r=1000\cdot {\displaystyle \frac{m_1}{m_2}}=1000\cdot {\displaystyle \frac{59}{62}}={\displaystyle \frac{29500}{31}}=951\frac{19}{31}=952\text{ ‰} \end{gathered}$$

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