In 2 Kg mixture of copper and aluminium, 30% is copper. How much aluminium powder should be added to the mixture so that the proportion of copper becomes 20%
Options:
A) 800 gm B) 600 gm C) 1200 gm D) 900 gm E) 1000 gm
Mixture = 2 kg = 2000g.   Copper = 30% of 2000 = 600g.   To make copper 20% of mixture, we should need to mix 1000g of Aluminum.   As,   2000 + 1000= 
<gadget id="calculator">2000 + 1000</gadget>
<output>3_000</output>
3000g mixture.   And 20% of 3000= 600g.   ANSWER : 600 gm
<result>B</result>
In 2 Kg mixture of copper and aluminium, 30% is copper. How much aluminium powder should be added to the mixture so that the proportion of copper becomes 20%