code: def fix_a_slash_b(self, string):
      if len(string.split("/")) != 2:
          return string
      a = string.split("/")[0]
      b = string.split("/")[1]
      try:
          a = int(a)
          b = int(b)
          assert string == "{}/{}".format(a, b)
          new_string = "\\frac{" + str(a) + "}{" + str(b) + "}"
          return new_string
      except AssertionError:
          return string
  
imports: import inspect
  import lm_eval.datasets.hendrycks_math.hendrycks_math
  from lm_eval.metrics import mean
  from lm_eval.base import Task, rf
label_desc: Use image node_id 20 for calling the Math obj's underlying member method code with example usage: obj.fix_a_slash_b(string) and returns: string, new_string, string