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