If 9 workers can build 9 cars in 9 days, then how many days would it take 7 workers to build 7 cars?	Choose the correct choice
A) 6  B) 7  C) 8  D) 9  E) 10

Rationale: "9 workers can build 1 car per day on average . 1 worker can build 1 / 9 of a car per day . 7 workers can build 7 / 9 car per day . the time required to build 7 cars is 7 / ( 7 / 9 ) = 9 days the answer is d ."
Answer: D