The body of a 150lb person contains 2.3 x 10-4lb of copper.

How much copper is contained in the bodies of 1200 such people?
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1 Answer

1200 peepl...1200*2.3e-4

or (1.2*e+3)*(2.3e-4)

=1.2*2.3e-1 or 1.2*2.3/10

=2.76/10

=0.276
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