Mathematics, 17.07.2019 16:40 tgraveslaylay2743
Pennies used to be made of copper and zinc and had a mass of 3.1g today pennies are made of copper plated zinc and have a mass of 2.5 g. a new pennies mass is what percent of an old pennies mass?
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Pennies used to be made of copper and zinc and had a mass of 3.1g today pennies are made of copper p...
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