Question

Zinc : Copper = 7 :3, what percent is copper in the whole mixture?​

Answer 1

Answer:

18.3g.

Given the ratio of copper and zinc in an alloy is 5:3.

Let weight of copper and zinc be 5x and 3x.

Then according to the problem we have,

5x=30.5

or, x=6.1

Then weight of zinc is 3×6.1=18.3 g