Question 1201413
Radius of the cylinder, 3 cm.
Radois of the nine spheres, 2 cm. each


volume of the spheres,  {{{9*(4/3)pi*2^3=9*8(4/3)pi}}}


h, for vertical length change in the cylinder volume when the 
spheres are put in,
{{{h*pi*3^2=9*8(4/3)pi}}}

{{{h*9=8*9(4/3)}}}

{{{h=8(4/3)}}}

{{{h=32/3=10&2/3}}}