input: Write a python function to convert pounds to kilograms.
  assert convert_to_kilograms(1) == 0.45454545454545453
  assert convert_to_kilograms(10) == 4.545454545454546
  assert convert_to_kilograms(50) == 22.727272727272727
output: def convert_to_kilograms(pounds):
      return pounds * 0.45454545454545453