I don't know what you mean here. First there should be averbin the first clause. If you meant the volume of the cylinderis"equal to n times the volume of the sphere", that's impossible. The volume of a cylinderinscribedin a sphere must belessthan then volume of the sphere, not "n times the volume".

how to solve this??

i know using the pyth theorem , the square of radius of cylinder + 1/2 square of the height of the cylinder is equal to square of the sphere's radius

i also list two volume equations

but how to do the next step???

because there are two variable, it seems cannot be reduced to only 1 variables

HELP!!!