Question

The ratio of zinc and copper in an alloy is 7 : 9. If the weight of copper in the alloy is 11.7 kg find the weight of zinc in it.

Answer 1

Let the weight of zinc be x kg.
Ratio of zinc and copper = 7:9
Weight of copper in the alloy = 11.7 kg

`7/9 =x/11.7 `

⇒  x = `(11.7×7)/9=81.9/9` = 9.1

Weight of zinc = 9.1 kg