[
  "Convert both mixed numbers to improper fractions. Find the LCM of 8 and 5 (which is 40) as the common denominator, then subtract.",
  "7 1/8 = 57/8 = 285/40. 2 1/5 = 11/5 = 88/40. 285/40 - 88/40 = 197/40.",
  "197/40 = 4 37/40. Answer: 4 37/40 (option A)."
]