Middle School:
Question: 24-karat gold is 100% pure gold. How many ounces of pure gold are there in a 15 pound, 16-karat gold bar?
Answer: 160 ounces
Solution: 16–karat gold is 16/24 pure gold, or 2/3. Since two thirds of the gold bar is pure gold, that means that there are 15 × 2/3 = 10 pounds of pure gold. There are 16 ounce in a pound, so 10 pounds of pure gold is the same as 160 ounces of pure gold.
Mathnasium of West Covina is a math-only learning center for K-12 students in West Covina, CA. Trusted by over a million parents, Mathnasium uses personalized learning plans and the proprietary Mathnasium Method™ to help students catch up, keep up, and get ahead on their math journey.
Our specially trained tutors deliver face-to-face instruction in a supportive and fun small-group environment, working with students to develop a deep understanding of math, build confidence, and improve academic performance.
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