Question

The ratio of copper and zinc in an alloy is 9 : 7. If the weight of zinc in the alloy is 9.8 kg, find the weight of copper in the alloy.

Answer 1

The ratio of copper and zinc in an alloy is 9 : 7.

When the weight of zinc is 7 kg, the weight of copper = 9 kg

When the weight of zinc is 1 kg, the weight of copper = $\frac{9}{7}$ kg

When the weight of zinc is 9.8 kg, the weight of copper = $\frac{9}{7}\times 9.8=12.6$ kg