### In 2 kg mixture of copper and aluminum, 30% is copper. How much aluminum 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

### Solution(By Apex Team)

According to the question, Mixture of copper and aluminum = 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}

## Related Questions On Alligation

A. 2 : 5
B. 3 : 5
C. 5 : 3
D. 5 : 2

### An alloy contains zinc, copper and tin in the ratio 2 : 3 : 1 and another contains copper, tin and lead in the ratio 5 : 4 : 3. If equal weights of both alloys are melted together to form a third alloy, then the weight of lead per kg in new alloy will be:

A. $\large\frac{1}{2} \mathrm{~kg}$
B. $\large\frac{1}{8} \mathrm{~kg}$
C. $\large\frac{3}{14} \mathrm{~kg}$
D. $\large\frac{7}{9} \mathrm{~kg}$

A. 81 liters
B. 71 liters
C. 56 liters
D. 50 liters