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An alloy of gold and copper weights 50 g. It contains 80% gold. How much gold should be added to the alloy so that percentage of gold is increased to 90?
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Solution
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Inital amount of gold =
1
0
8
×
5
0
=
4
0
gm
Let amount of gold required to me mixed =
X
gm
According to question ,
4
0
+
x
=
1
0
9
×
(
5
0
+
x
)
Solving we get
x
=
5
0
gm
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