2 + 7 is 9, 9 + 9 is 18, + 9 is 27, + 5 is 32, + 8 is 40, + 8 is 48 and 48 is divisible by three, but in case you're not sure, since this is equal to 48, in case you're not sure whether this is divisible by 3, you can just add these digits up again.