Question

In every gram of gold, a goldsmith mixes 0.25 grams of silver and 0.05 grams of copper. What is the percentage of gold, silver and copper in every gram of gold?​

Answer 1

Answer:

Gold=70%

Silver=25%

Copper=5%

Step-by-step explanation:

Silver Amt= 0.25 gm

Copper Amt= 0.05 gm

Gold Amt = 0.25+0.05+x=1 Gm

=0.30+x=1gm

=x=1-0.30

=0.70 gm

Gold % = 70x10/100

=70%

Silver % = 25x100/100

=25%

Copper % = 5x100/100

=5%

Answer 2

Step-by-step explanation:

1 g = 1000mg

Value of silver is 0.25 g = 25 mg

= 25/1000 * 100

= 2.5%

Value of copper is 0.5g = 5 mg

5/1000 * 100

= 0.5%

Value of gold is 1000mg - 25mg + 5mg

= 970mg

= 970/1000 * 100

= 97%