Question

7. An alloy consists of 7 parts of zinc and 33 parts of copper. Find the percentage of
copper in the alloy​

Answer 1

Percentage of Copper = 82.5%

Total Parts of Alloy = 7+33 => 40

% of Zinc = $\sf{\dfrac{7}{40}\times 100 = \dfrac{7}{2}\times5=17.5\%}$

% of Copper = $\sf{\dfrac{33}{40}\times100=\dfrac{33}{2}\times5=82.5\%}$

Therefore, the total percent adds up to 100%.

So,

% of Zinc = 17.5%

% of Copper = 82.5%

Hope it helps u

Have a great day ahead

Annyeong

Answer 2

Answer:

Percentage of Copper = 82.5%

Total Parts of Alloy = 7+33 => 40

% of Zinc = \begin{gathered}\sf{\dfrac{7}{40}\times 100 = \dfrac{7}{2}\times5=17.5\%}\\\end{gathered}

40

7

×100=

2

7

×5=17.5%

% of Copper = \begin{gathered}\sf{\dfrac{33}{40}\times100=\dfrac{33}{2}\times5=82.5\%}\\\end{gathered}

40

33

×100=

2

33

×5=82.5%

Therefore, the total percent adds up to 100%.

So,

% of Zinc = 17.5%

% of Copper = 82.5%

Hope it helps u