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You know the teacher is not only strict, but evil. There is not enough information to narrow it down to a single pair of numbers. For one thing, 247 has only two prime factors, 13 and 19. You might get y = 1 and x = 9.5, hence x - y is 8.5, but y = -12, x = 19 is equally valid (x - y = 31. Basically as long as y = 247/x - 25, your answer will be valid.
