Question

Two lumps of gold, silver and copper together weigh
20 kg. One lump contains 75% gold and 31.25 g silver
per kilogram. Another lump contains 85% gold and
30 g silver per kilogram. The total quantity of silver
in two lumps is 617.5 g. If two lumps are melted to
form one, the percentage of gold in it will be
(a) 75% (b) 87%
(c) 15.6%
(d) 78%
(e) 60%​

Answer 1

Answer:

d) 78% of gold in it will be