A and B are two alloys of gold and copper prepared by mixing metals in proportions
7:11 respectively. If equal quantities of the alloys are melted to form a third alloy C, the propo
tion of gold and copper in C will be ?
1) 5:9
2) 5:7
3) 7:5
4) 9:5
5) None of these
1
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Answers
Answered by
5
Answer:
3)7:5
Step-by-step explanation:
Let 100 gm of alloy A and 100 gm of alloy B
Gold in alloy A=
9
7
×100
copper in alloy A=
9
2
×100
Gold in alloy B=
18
7
×100
Copper in alloy B=
18
11
×100
Gold in alloy C=
9
700
+
18
700
=
18
2100
Copper in alloy C=
9
200
+
18
1100
=
18
1500
Ratio of copper and iron in alloy C=
18
2100
:
18
1500
7:5
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