Q6:
The ratio of the number of red cars in a certain parking lot to the number of black cars is 3 to 8. If there are 72 black cars in the lot, how many red cars are there in the lot?
A. 11
B. 15
C. 24
D. 27
E. 32
我算的答案是27，答案却是24。请问我哪里做错了？
（3/8 = X/72 x=27） | 
