Question

7. An alloy consists of 13 parts of copper, 7 parts of zinc and 5 parts of nickel.
What is the percentage composition of the alloy?
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Answer 1

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

Answer 2

Step-by-step explanation:

Total Parts of Alloy = 13+7+5 =

=> 25

% of Copper = = 13

25 x 100 = 13 x 4 = 52%

% of Zinc = 7

25 x 100 = 7 x 4 = 28%

% of Nickel

5 25 x 100 = 5 x 4 = 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