Answer :

Given,

The ratio of copper and zinc in mixture = 5:2

Let copper in mixture is “5a”.

So, zinc will be “2a”.

Given that quantity of brass (mixture of copper and zinc) = 28 kg

⇒ quantity of copper+ quantity of zinc = 28

⇒ 5a + 2a = 28

⇒ 7a = 28

Or, a = 4

So, quantity of zinc = 2a = 2×4 = 8 kg

Also, quantity of copper = 5a= 5×4= 20 kg

According to given problem,

If we add 4 kg of copper

Then quantity of copper in mixture = 20+4 = 24kg

So, the ratio of copper and zinc in 28 kg of brass

= 3:1

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