How many nickels will fit in a 2 liter bottle

A nickel has a diameter of 21.21 mm and a thickness of 1.95 mm 

2.121 cm diameter 
0.195 cm thickness 

Think of a nickel as a cylinder 

r = 2.121/2 = 1.0605 cm 

V = pi * r^2 * h 
V = pi * 1.0605^2 * 0.195 cubic cm 

2 liters = 2000 cubic cm 

2000 / (1.0605^2 * 0.195 * pi) => 
2902.84713216 

Your upper limit is 2902, but it could be as little as 0 (for instance if the 2L bottle was only 1 cm wide, then you wouldn't be able to fit a single nickel in there) 

I'd say that you could expect about a 70% packing efficiency, just off the top of my head 

2900 * 0.7 => 
290 * 7 => 
300 * 7 - 10 * 7 => 
2100 - 70 => 
2030 

I'd expect around 2000 nickels would fill up the bottle quite nicely, supposing you can get the nickels into it.

Answer\ __o_o__/ lil i don’t kniw

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)