Question

The metal called brass is a combination of zinc and copper . Brass 30 %is zinc and 70 % copper if a piece of brass weight 100 kg,how much of it is coppers?

Answer 1

$\boxed{\boxed{\large\mathbf{70 \: kg}}}$
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$\underline{\underline{\huge\mathfrak{ANSWER}}}$

$\underline\text{We know that,}$

$\mathbf{Brass \: contains \: 70 \% \: of \: Copper.}$

Weight of Brass = 100 kg
Weight of Copper = ?

$\underline\text{Using the Formula,}$

Value of Percentage = $\mathsf{\frac{70}{\cancel{100}} \times \cancel{100}}$

$\mathsf{\Longrightarrow 70}$

Hence, a $\mathsf{100 kg}$ piece of $\bf{Brass}$ contains $\mathsf{70 kg}$ of $\bf{Copper.}$

Also,

Weight of Zinc = Weight of Brass - Weight of Copper

$\mathsf{\Longrightarrow Weight \: of \: Zinc = 100 - 70}$

$\mathsf{\Longrightarrow Weight \: of \: Zinc = 30 kg}$

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Answer 2

Answer:

70 kg copper and 30kg zinc