Multiple choice

75 kg of alloy A is mixed with 35 kg of alloy B. A contains brass and copper in the ratio 4 : 1, and B contains them in the ratio 3: 4 respectively. If both alloys are mixed then what is the ratio of brass to copper in the mixture?

  1. 15 : 7

  2. 7 : 15

  3. 5 : 11

  4. 11 : 9

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alloy A: 75kg with brass:copper = 4:1, so brass = 60kg, copper = 15kg. Alloy B: 35kg with brass:copper = 3:4, so brass = 15kg, copper = 20kg. Total: brass = 75kg, copper = 35kg. Ratio = 75:35 = 15:7.

Keep practicing — related questions