GIVEN: Weight of alloy = 85 kg The ratio of weights of lead. Iron, and tin = 3 ∶ 5 ∶ 9 EXPLANATION: Total weight in ratio =3+5+9=17 unit 17 unit = 85 kg ⇒ 1 unit = 5 kg Difference between weights of tin and lead = 9 – 3 = 6 unit ⇒ 6 unit = 30 kg ∴ The answer will be 30 kg