Posted by **inny** on Friday, October 15, 2010 at 4:34am.

A bag contains a mixture of copper and lead BBs. the Average density of the BBs is 9.50g/cm^3. Assuming that the copper and lead are pure determine the relative amounts of each kind of BB

- college math -
**drwls**, Friday, October 15, 2010 at 5:50am
Look up the densities of lead and copper. Lead: 11.34 g/cm^3. Copper: 8.93 g/cm^3

If f is the fraction of the BBs that are copper (which would be a volume fraction), then 1-f is the fraction that are lead, then

8.93 f + 11.34(1-f) = 9.50

Solve for f

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