The interior of a rectangular carton is designed by a certain manufacturer to have a volume of x cubic feet and a ratio of length to width to height of 3:2:2. In terms of x, which of the following equals the height of the carton, in feet?
A.3√x
B.3√[(2x)/3]
C.3√[(3x)/2]
D.(2/3) 3√x
E.(3/2) 3√x
不懂,WHY....HELP!! :'(