if 8 workers can build 8 cars in 8 days , then how many days would it take 4 workers to build 4 cars ?
8 workers can build 1 car per day on average . 1 worker can build 1 / 8 of a car per day . 4 workers can build 1 / 2 car per day . the time required to build 4 cars is 4 / ( 1 / 2 ) = 8 days the answer is c .
multiply(divide(multiply(8, 8), 8), divide(4, 4))