In an alloy of 60 grams, the ratio of gold and copper is 2 : 1. How much more of copper should be added to make the ratio 1 : 2?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 60 grams.
Given:
In an alloy of 60 grams, the ratio of gold and copper is 2 : 1
Explanation:
Quantity of Gold in Alloy = 60 × 2/3 = 40 gm
Quantity of Copper in Alloy = 60 × 1/3 = 20 gm
The x quantity of Copper added
⇒ (40)/(20 + x) = 1/2
⇒ 80 = 20 + x
⇒ x = 60 grams