An inflated beach ball with radius r = 25 centimeters holds approximately 65,400 cubic centimeters of air. When the ball is compressed, the radius is 2/3 the original size. Approximately how much air does the partially deflated ball now hold?

Question

anonymous · Answer

19,400 cm^3
    14,500 cm^3
    1,200 cm^3
    4,800 cm^3

anonymous · Answer

@SweetsAndEverything 
@electrokid

anonymous · Answer

we do not need the exact formula..
just understand that volume is proportional to the cube of the radius
$$
V\propto r^3\
{V_1\over V_2}={r_1^3\over r_2^3}
$$
V1 = 65400, r1=25
V2=?   r2=2*25/3