If all multiples of 3 and all multiples of 4 are removed from the list of whole numbers 1 through 1200, then how many whole numbers are left?
There will be 600 numbers left. There are 400 multiples of 3 up to 1200, and 300 multiples of 4, and 100 multiples of 12
400+300-100 = 600
1200 - 600 = 600
