Question

The weights of Zinc, Copper, and Iron in an alloy are in the ratio 3 : 5 : 4. In the alloy weighing 72 kg the difference between the weights of Iron and Zinc is?
1. 4 kg
2. 5 kg 
3. 6 kg
4. 7 kg
5. 8 kg

Answer 1

Correct Answer - Option 3 : 6 kg

Given:

Zinc : Copper : Iron = 3 : 5 : 4

Weight of alloy = 72 kg

Calculation:

Total weight = 3 + 5 + 4 = 12 ratio

so, 12 ratio = 72 kg

1 ratio = 6 kg

Difference in weight = 4 - 3 = 1 ratio = 6 kg

∴ The difference is 6 kg