Question

An alloy is to contain copper and zinc in the ratio 9 : 4 .. The zinc required to be melted, with 24 kg of copper is :

• A. 10$\frac{2}{3}$ kg
• B. 10$\frac{1}{3}$ kg
• C. 9$\frac{2}{3}$ kg
• D. 9 kg

Answer 1

Answer: (A)

10$\frac{2}{3}$ kg

Let copper be $9x$ & zinc be $4x$

Copper $\Rightarrow 9x=24$kg

$\Rightarrow x=\frac{24}{9}$

Zinc $\Rightarrow 4x=4\times \frac{24}{9}$

$\Rightarrow 10\frac{2}{3}$kg.