input: Write a python function to find the sum of the two largest numbers in a list.
  assert find_sum_of_largest([1, 3, 5, 7, 9]) == 16
  assert find_sum_of_largest([10, 20, 30, 40, 50]) == 90
  assert find_sum_of_largest([5, 5, 5, 5, 5]) == 10
output: def find_sum_of_largest(numbers):
      numbers.sort()
      return numbers[-1] + numbers[-2]