In 50 gm alloy of gold and silver the gold is 80 % by weight. How much gold should be mixed with this alloy so that the weight of gold would become 95 %?
Q1. In 50 gm alloy of gold and silver the gold is 80 % by weight. How much gold should be mixed with this alloy so that the weight of gold would become 95 %?
Answer: 150 gm
Explanation: Let x grams of pure gold be added: (40+x)/(50+x) = 0.95 → 0.05x = 7.5 → x = 150 gm.