Question 1132866
{{{density=mass/volume}}}

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{{{3*cm*3*mm*((1/10)(cm/mm))*3*dm(10(cm/dm))}}}


{{{27*cm^3}}}{{{volume}}}


Can you do the rest?


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Platinum weighs 21.5 times as heavy as water. 
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Water is about 1.00 grams per cubic centimeter; so this would mean platinum should be 21.5 grams per cubic centimeter.

{{{27*cm^3*21.5(grams/cm^3)=581*grams}}}