Multiple choice

In two alloys the ratio of Iron and Copper is 4 : 3 and 6 : 1 respectively. If 14 kg of the first alloy and 42 kg of the second alloy are mixed together to form a new alloy, then what will be the ratio of Copper to Iron in the new alloy?

  1. 11 : 8

  2. 11 : 3

  3. 8 : 11

  4. 3 : 11

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

First alloy (14 kg): Iron = (4/7)×14 = 8 kg, Copper = (3/7)×14 = 6 kg. Second alloy (42 kg): Iron = (6/7)×42 = 36 kg, Copper = (1/7)×42 = 6 kg. Combined: Total Copper = 6 + 6 = 12 kg, Total Iron = 8 + 36 = 44 kg. Ratio of Copper to Iron = 12:44 = 3:11.