The length of a rectangular garden is three times its width. If the area of the rectangular garden is 432 square meters, then what is the width of the rectangular garden? Choices:
A) 8
B) 9
C) 10
D) 11
E) 12

Rationale: "let x be the width of the garden . 3 x ^ 2 = 432 x ^ 2 = 144 x = 12 the answer is e ."
Answer: E