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Question

50 g of an alloy of gold and silver contains 80% gold ( by weight). The quantity of gold that is to be mixed up with this alloy, so that it may contain 95% gold is
  1. 150 g
  2. 50 g
  3. 10 g
  4. 200 g

A
200 g
B
10 g
C
150 g
D
50 g
Solution
Verified by Toppr

In 50 gm of an alloy of gold and silver the quantity of gold =40 gm and the quantity of silver =10 gm
Let x gm of gold be mixed in 50 gm of an alloy of gold and silver such that quantity of gold becomes 95%.
Then 40+x=95% of (x+50)
40+x=1920(x+50)
800+20x=19x+950
x=150

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