input: Write a python function to find all numbers greater than 30 in a list.
  assert find_numbers_greater_than_30([20, 35, 10, 47])==[35, 47]
  assert find_numbers_greater_than_30([25, 30, 40, 50, 5, 60])==[40, 50, 60]
  assert find_numbers_greater_than_30([10, 20, 30])==[]
output: def find_numbers_greater_than_30(lst):
      return [x for x in lst if x > 30]