If 8 workers can build 8 cars in 8 days, then how many days would it take 7 workers to build 7 cars? Select the correct option
A) 4
B) 7
C) 8
D) 12
E) 14
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)= 
<gadget id="calculator">7 / (7/8)</gadget>
<output>8</output>
8 days   The answer is 8.
<result>C</result>
If 8 workers can build 8 cars in 8 days, then how many days would it take 7 workers to build 7 cars?