Three spherical balloons A, B, and C have
volumes such that the volume of B is twice
the volume of A, and the volume of A is one
third the volume of C. If the radius of B is 10
centimeters, what is the radius of C, to the
nearest tenth of a centimeter?
(Note: The volume of a sphere is equal to
V= 4/3 pi r^3

A.7.9
B. 11.4
C. 14.4
D. 15.0
E. 18.5