Answer:
Step-by-step explanation:
First, figure out how many pennies there are by dividing the total length by the length of one penny:
[tex]\frac{20}{1.55}=12.9[/tex]
Next, multiply the total number of pennies by the mass of one penny:
[tex]\frac{20}{1.55}*4=51.61[/tex]
If necessary, round this:
[tex]51[/tex] grams
