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An alloy contains 10g copper,20g tin and 20g silver.What is the percentage of copper in the alloy?

$\begin{array}{1 1}(A)\;20\%&(B)\;25\%\\(C)\;30\%&(D)\;11\%\end{array} $

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20% is the percentage of copper in the alloy
Hence (A) is the correct answer.
answered Apr 11, 2014 by sreemathi.v
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