1. 4.5 Litre

Not sure how to approach this question. If i filled a 4.5 litre bottle with pennys how much would be in there.

Any help appreciated?

2. Originally Posted by craig_r
Not sure how to approach this question. If i filled a 4.5 litre bottle with pennys how much would be in there.

Any help appreciated?
You'd need to find the volume of a penny which is $V = \frac{\pi D^2h}{4}$

where
• V = Volume
• D = Diameter
• h = thickness

Once you know the volume of a penny you can do

$n = \frac{4.5 \times 10^6}{V}$

to get the number of pennies (n). That formula only works for measuring the penny's thickness and diameter/radius in mm

Bear in mind this will be an overestimate because it does not account for gaps between the pennies.