Question

The percentage of metals in a mine of zinc ore is $60\%$. Now the percentage of silver is $\frac{3}{4}\%$ of metals and the rest is zinc. If the mass of ore extracted from the mine is 8000 kg, then find the mass (in kg) of zinc ?

Answer 1

Mass of zinc ore $=8000$kg

Mass of metal $=60\%$ of $8000=4800$kg

Mass of silver in metal $=\frac{3}{4}\times \frac{4800}{100}=36$ kg

Mass of zinc $=4800-36=4764$ kg.