input: Write a python function to find numbers divisible by both 3 and 5.
  assert divisible_by_3_5([5, 15, 20, 7, 10]) == [15]
  assert divisible_by_3_5([30, 45, 60, 75, 90]) == [30, 45, 60, 75, 90]
  assert divisible_by_3_5([1, 2, 3, 4, 5]) == []
output: def divisible_by_3_5(numbers):
      return [num for num in numbers if num % 3 == 0 and num % 5 == 0]