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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}.