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Ratio of Ore to Copper

Date: 9/4/96 at 19:14:27
From: Anonymous
Subject: Ratio of Ore to Copper

A certain ore contains 2 percent copper.  How much ore is needed to 
obtain 24 tons of copper?

Date: 9/4/96 at 21:47:51
From: Doctor Robert
Subject: Re: Ratio of Ore to Copper

Let x be the number of tons of ore needed.  If you have x tons of ore,
then you have .02x tons of copper.  So, .02x = 24.  Dividing both 
sides by .02 you get x = 1200 tons.  You need 1200 tons of 2 percent 
copper ore to get 24 tons of copper.

-Doctor Robert,  The Math Forum
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Associated Topics:
Middle School Ratio and Proportion

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