Question 20: Shubhi saw a beautiful ring which was made of Electrum. Electrum is an alloy
of gold and silver with a small amount of other metals and is white in colour.
The ratio of gold and silver in a sample of electrum is 9:7.If the weight of the silver in that
sample of alloy is 9.8 kg. Then, what is the weight of the gold in the alloy?
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Answer:
Electrum is an alloy of gold and silver with a small amount of other metals and is white in colour. The ratio of gold and silver in a sample ...
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14
Answer:
The correct answer is 12.6 kg.
Explanation:
Let the weight of alloy is x kg.
This amount of silver in alloy 7x/(7+9) =7x/16
Given the weight of the silver in that sample of alloy is 9.8 kg.
7x/16 =9.8
x=(16×9.8)/7=22.4 kg
Weight of gold in that sample=22.4–9.8=12.6 kg
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