If 8 workers can build 8 cars in 8 days, then how many days would it take 7 workers to build 7 cars?	Choose the correct choice from the following.
A) 4
B) 7
C) 8
D) 12
E) 14

Rationale: "8 workers can build 1 car per day on average . 1 worker can build 1 / 8 of a car per day . 7 workers can build 7 / 8 car per day . the time required to build 7 cars is 7 / ( 7 / 8 ) = 8 days the answer is c ."
Answer: C