Solution: How many ounces of the 60% pure gold must be used?

A goldsmith has two alloys of gold, the first being 70% pure and the second being 60% pure. How many ounces of the 60% pure gold must be used to make 100 ounces of an alloy which will be 66% gold? How to solve mixture problems?

How many ounces of the 60% pure gold must be used?

Problem Statement:

A goldsmith has two alloys of gold, the first being 70% pure and the second being 60% pure. How many ounces of the 60% pure gold must be used to make 100 ounces of an alloy which will be 66% gold?

Problem Answer:

The goldsmith must use 40 ounces of 60% pure gold to make 100 ounces on an alloy which will be 66% gold.

Solution:

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