Question

The ratio of copper and zinc in an alloy is 8:9. If the weight of zinc in the alloy is 3.6kg, find the
weight of copper in the alloy.

Answer 1

Answer:

3.6kg × 1000

3600g ÷ 9

= 400g

= 400g × 8

= 3200g

= 3.2kg

Answer 2

Answer:

The weight of Copper = 3.2 kg

Step-by-step explanation:

Given :

• Ratio of copper and zinc = 8:9

• The weight of Zinc in alloy =3.6 kg

To find :

• Weight of Copper in alloy

Solution :

Let, Take the Weight of Copper as x ;

$\longrightarrow \sf 8 : 9 = x: 3.6 \\ \\ ⟶ \sf \: \frac{8}{9} = \frac{x}{3.6} (cross \: multiply) \\ \\ ⟶ \sf \: 8 \times 3.6 = 9 \times x \\ \\ ⟶\sf 28.8 = 9x \\ \\ \sf⟶ \: x = \frac{28.8}{9} \\ \\ \bf⟶ x \: = 3.2$

∴ The weight of Copper in alloy is 3.2 kg

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