input: Write a python function to reverse a list and return the sum of the reversed list.
  assert reverse_list([1, 2, 3, 4, 5])==15
  assert reverse_list([10, 20, 30])==60
  assert reverse_list([7, 8, 9])==24
output: def reverse_list(lst):
      reversed_lst = lst[::-1]
      return sum(reversed_lst)