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12 November, 21:02

1 penny has a mass of 4 grams and is 1.55 millimeters thick. How much mass will a stack of 20 pennies tall have?

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  1. 12 November, 21:30
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    Since each penny has a mass of 4 grams, and we want to find out how much mass 20 pennies has, we do 4 (for 1 penny) * 20=80 grams
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