input: from typing import Optional
  import random
  
  
  def generate_even_number() -> Optional[int]:
      """Generate an even number between 10 and 200 that is divisible by 5.
      >>> random.seed(42)
      >>> generate_even_number()
      25
      >>> random.seed(13)
      >>> generate_even_number()
      30
      """
      num = random.randint(10, 200)
      if num % 2 == 0:
          if num % 5 == 0:
              return num
          else:
              return generate_even_number(num+1)
      else:
          return generate_even_number(num+1)
output:     num = random.randint(10, 200)
      while True:
          if num % 2 == 0 and num % 5 == 0:
              return num
          num = random.randint(10, 200)