Question

an alloy consists of 13 parts of copper to 7 parts of zinc and 5 parts of Nickel what is the percentage of composition of a alloy

Answer 1

Total of all Parts =  13 + 7 + 5  =  25

% composition of Copper = 13 / 25 * 100  =  52%

% composition of Zinc = 7 / 25 * 100  =  28%

% composition of Nickel = 5 / 25 * 100  =  20%

Answer 2

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%

Hope it helps u

Have a great day ahead

Annyeong