Multiple choice

The ratio of zinc and copper in a brass piece is 13 : 7. How much zinc will be there in 100 kg of such a piece?

  1. 20 kg

  2. 35 kg

  3. 55 kg

  4. 65 kg

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

The ratio of zinc to copper is 13:7, meaning in every 20 parts of the brass alloy, 13 parts are zinc and 7 parts are copper. For 100 kg of brass, zinc = (13/20) × 100 = 65 kg. Option A (20 kg) would be copper, Option B (35 kg) is incorrect, and Option C (55 kg) has no calculation basis.