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OpenStudy (lena772):
A student weighs 885 pennies and finds them to have a mass of 2500.4 g. If the pre-1982 pennies weigh on average 3.09 g and the post-1982 pennies weigh 2.51 g, how many of the pennies are post-1982?
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OpenStudy (amistre64):
write up a system of equations ...
OpenStudy (amistre64):
x + y = total # of pennies x pre + y post = observed weight
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