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March 30, 2015

March 30, 2015

Posted by **Jake** on Thursday, December 9, 2010 at 8:39pm.

- 8th grade -
**TutorCat**, Thursday, December 9, 2010 at 11:11pm.25(x)+.50(1000-x)=.45(1000)

where x is the number of grams of 25% copper

and 1000-x is the rest of the 1000 grams i.e. the number of grams of 50%

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