solid geometry

Question

A solid metal cuboid of dimensions 25ft*16ft*15 5/7 is melted to form a cylindrical rod of base diameter 5ft or 10ft or 20ft.

what is the length of the rod?

 

(a)5

(b)20

(c)60

(d)80

(e)100

Answer 1

find the volume of the cube V = h*w*l  =  25*16*15 5/7.

 Units for the 15 5/7 measurement not explicitly stated , assume feet.

 

find the height of a cylinder with 5,10,20 foot diameters ( 3 answers)

 

V= pi R^2 * h

h = V / pi R^2      R is of course D/2 so 2.5, 5, and 10 feet

 

the answers are  320,80,20  for the 5,10,20 ft diameters respectively.

I must be missing something, there is no answer 320.

someone want to check out the procedure I outlined to see if there is an error?