For an employee training, the employee to instructor ratio is 18 to 2. If there are 24 instructors for the training, how many employees participated in the training?
A. 360
B. 216
C. 288
D. 144
The total ratio is 18+2 = <<18+2=20>>20
Since the number equivalent to 1 ratio is given by 24 instructors, therefore 20 ratios is to 24 x 20 = <<24*20=480>>480 instructors.
So, the number of employees participated in the training is 480 - 24 = <<480-24=456>>456
Therefore, the answer is A. 360. Answer: \boxed{360}.