Question 1080417
r, radius of upper pond surface


{{{2pi*r=11.9}}}

{{{r=5.95/pi}}}


pond volume:  {{{(1/2)(4/3)pi*r^3}}}
{{{(2/3)pi*r^3}}}
{{{(2/3)pi*(5.95/pi)^3}}}
 
14.2285 cubic feet



Part A -
3.6 cubic feet per goldfish

{{{14.2285/3.6=3.952}}}
Maybe 4 goldfish



Part B -
{{{14.2285-5.3=8.9285}}} cubic feet after 1 goldfish
-
{{{8.9285/1.6=5.58*goldfish}}}---best to round down. Rounding up to 6 fish could exceed what the website recommends.


Use 5 goldfish after the first one, for a total of 6 goldfish