12. An alloy contains 32% nickel, 36% copper and the rest is zinc. Find in grams the quantity of each of the contents in a sample of 1/4 kg alloy.
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Answer:
Percentage of copper in the alloy =
40
%
Percentage of nickel in the alloy=
32
%
Therefore, Percentage of zinc in the alloy =
100
%
−
(
40
%
+
32
%
)
=
100
%
−
72
%
=
28
%
Then mass of zinc in one kg of alloy =
1
kg
×
28
%
=
1000
×
28
100
gm [As
1
kg=
1000
gm]
=
280
gm
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