bipolarbear wrote:

Among the 200 cars displayed at an auto show, 50 had built-in air conditioners and 63 had traction control systems. If 12% of cars with air conditioners had traction control systems, what percent of the cars without air conditioners had traction control systems?

* 35

* 36

* 38

* 40

* 45

don't we need to say that all cars at the show could only have AC or traction systems or both?

From the question, i arrived at 38%.

total no.of cars = 200;

Cars with air conditioning = 50

Cars without air conditioning = 200-50 = 150

Cars wtih traction system = 63

Cars with A/C and traction = 12% of A/c = 6

so rest of the traction systems are installed in non A/C cars which is 57/150 = 38%