Question

Nickel silver, which will contain 65 per cent copper, 15 per cent zinc and 20 per cent nickel

Answer 1

But like the 10-rupee coin, it will be two-toned. While the outer ring will be 65 per cent copper, 15 per cent zinc and 20 per nickel, the inner disc will be 75 per cent copper, 20 per cent zinc and five percent nickel