If all multiples of 3 and all multiples of 4 are removed from the list of whole numbers 1 through 1000, then how many whole numbers are left?
1000 / 3 = 333 multiples of 3
1000 / 4 =250 multiples of 4
333 + 250 =583 combined multiples of 3 and 4.
1000 / 12 =83 multiples of 12 which is double counted.
583 - 83 = 500 numbers will remain after removing all multiples of 3 and 4.