Carol and Jordan draw rectangles of equal area. If Carol's rectangle measures 12 inches by 15 inches and Jordan's rectangle is 9 inches long, how wide is Jordan's rectangle, in inches? Choose the correct choice from the following answers:
A) 17 B) 18 C) 19 D) 20 E) 21

Rationale: "area of first rectangle is 12 * 15 = 180 hence area of second would be 9 x = 180 x x = 20 answer is d"
Answer: D