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January 31, 2015

January 31, 2015

Posted by **swagnik** on Thursday, February 23, 2012 at 5:45am.

- math -
**Reiny**, Thursday, February 23, 2012 at 8:29amzinc : copper = 7:9

zinc/11.7 = 7/9

zinc = 11.7(7/9) = ....

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