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A metallic part of a machine is made from a mixture of copper, zinc and lead mixed in the ratio of 13 : 6 : 1. If the weight of zinc in this part is 90 kg, then the total weight of the part will be:
1. 285 kg
2. 210 kg
3. 195 kg
4. 300 kg

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Correct Answer - Option 4 : 300 kg

Given:

Copper : Zinc : Lead = 13 : 6 : 1

Quantity of zinc = 90 kg 

Calculation:

Let the part of copper, zinc and lead are 13y, 6y, y

13y + 6y + y = 20y (Total)

⇒ 6y = 90kg 

∴ Total weight of the machine part = 20y = 90kg/6y × 20y 

⇒ 300 kg 

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