input: Write a python function to check if all numbers in a list are divisible by 5.
  assert checkDivisible([10, 15, 20, 25, 30]) == True
  assert checkDivisible([10, 15, 22, 25, 30]) == False
  assert checkDivisible([5, 10, 20, 35, 55]) == True
output: def checkDivisible(lst):
      return all(x % 5 == 0 for x in lst)