Question

An alloy consists of 13 parts of copper,7 parts of zinc and 5 parts of nickel.Find the percentage of copper in this alloy.

Answer 1

Total parts an alloy consists = 13+7+5
=25
% of copper = 13/25×100 =52%

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Answer 2

Percentage of Copper = 52%

Total Parts of Alloy = 13+7+5 => 25

% of Copper = $\sf{\dfrac{13}{25}\times 100 = 13\times4=52\%}$

% of Zinc = $\sf{\dfrac{7}{25}\times100=7\times4=28\%}$

% of Nickel = $\sf{\dfrac{5}{25}\times100=5\times4=20\%}$

Therefore, the total percent adds up to 100%.

So,

% of Copper = 52%

% of Zinc = 28%

% of Nickel = 20%

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Annyeong