In 50 gm alloy of gold and silver, the gold is 80% by weight.

In 50 gm alloy of gold and silver, the gold is 80% by weight. How much gold should be mixed to this alloy so that the weight of gold would become 95% ?

Initial quantity of gold =	50 × 80	= 40 gm
	100

Let 'm ' gm be mixed.

(40 + m) = (50 + m) ×	95
	100

⇒ 40 + m = (50 + m) ×	19
	20

⇒ 800 + 20m = 950 + 19m
⇒ m = 150 gm