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

User KwintenP
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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
User Allen Koo
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