###
**In 2 kg mixture of copper and aluminium, 30% is copper. How much aluminium powder should be added to the mixture so that the quantity of copper becomes 20% ?**

A. 900 gms
B. 800 gms
C. 1000 gms
D. 1200 gms
**Answer: Option C**

## Show Answer

Solution(By Apex Team)

According to the question,
Mixture of copper and aluminium = 2000 gms
30% is copper means
$\begin{aligned}&=\frac{30}{100}\times2000\\
&=600\mathrm{gms}\text{ copper }\\
&\Rightarrow\frac{600}{1400+x}=\frac{20\%}{80\%}\\
&\Rightarrow1400+x=2400\\
&\Rightarrow\mathrm{x}=1000\mathrm{gms}\end{aligned}$

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