In a race of 50 participants, E is ranked 12th from the top and F is ranked 15th from the bottom. What is the total number of participants?
Answer: A. 50
If E is 12th from the top, then there are 38 participants below E. If F is 15th from the bottom, then there are 35 participants above F. Therefore, total participants = 12 + 38 = 50.