Correct Answer - Option 5 : 90 kg
Given:
Ratio
|
Copper : Zinc
|
Alloy A
|
4 ∶ 5
|
Ratio
|
Zinc : Aluminium
|
Alloy B
|
7 ∶ 9
|
Quantity of zinc in the final mixture = 70 kg
Calculation:
Ratio of copper, zinc and Aluminium = (4 × 7) ∶ (5 × 7) ∶ (5 × 9)
⇒ 28 ∶ 35 ∶ 45
Now, quantity of Aluminium in final mixture = (45/35) × 70 kg
⇒ 90 kg
∴ The quantity of Aluminium in the final mixture is 90 kg.