Question

the ratio of zinc to copper in an alloy is 2:5, find the quantity of zinc to copper in 4.2 kg of the alloy

Answer 1

Answer: The answer is 3 kg.

Step-by-step explanation: Given that there is 4.2 kg of an alloy. The alloy contains zinc and copper in the ratio 2 : 5.

We are to find the quantity of copper in the alloy.

Let, '2x' and '5x' be the quantities of zinc and copper respectively in the alloy. Then, we have

\begin{lgathered}2x+5x=4.2\\\\\Rightarrow 7x=4.2\\\\\Rightarrow x=0.6.\end{lgathered}

2x+5x=4.2

⇒7x=4.2

⇒x=0.6.

Therefore, the quantity of copper in the alloy is

= 5 × 0.6

= 3.

Thus, the required quantity is 3 kg.