Question

An alloy contain Iron, Copper and Tin in the ratio of 1 : 2 : 3 and another contains copper, tin and lead in the ratio of 4 : 5 : 1. If equal weights of both alloy are melted together to form third alloy then the weight of lead per kg in new alloy will be?

1. 1/40
2. 1/20
3. 1/30
4. 1/10
5. None of these

Answer 1

Correct Answer - Option 2 : 1/20

Given :

 Ratio of Iron, Copper and Tin = 1 : 2 : 3

Ratio of copper, tin and lead = 4 : 5 : 1

Calculations :

Quantity of lead in 1 kg of 1st alloy = 0

Quantity of lead in 1 kg of 2nd  alloy = 1/10 kg

 Quantity of lead in 2 kg of 3rd alloy = 1/10

 Quantity of lead in 1 kg of 3rd alloy = 1/20

∴ Quantity of lead in 1 kg of 3rd alloy is 1/20