Question

A gold alloy contains 15 milligrams

of gold for every 4 milligrams of copper. A jeweler uses
48 milligrams of copper to make the alloy. How much
gold does the jeweler use to make the alloy?​

Answer 1

180 milligrams

Step-by-step explanation:

You divide 48 by 4 which comes to 12. Divide 12 times 15 milligrams of gold this gets you 180

Answer 2

Answer: There are 180 milligrams of gold in the alloy.

Step-by-step explanation: We know that for every 4 milligrams of copper, there are 15 milligrams of gold.

if 48 milligrams of copper are used, we can separate them in "sets" of 4 milligrams.

We have 48/4 = 12 sets.

And for each one of these 12 sets, there are 15 milligrams of gold, then the total amount of gold in the alloy is:

12*15mg = 180 mg