424 is an even number so passes first test, but digits do not add to a multiple of 3 so it fails second. It is not a multiple of 6. 426, however, is, as is 444.
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No
882
6 + (23 424 243 423 423 243 244 224 242 424) = 23 424 243 423 423 243 244 224 242 430
424
ANSWER: 80.5619% of 424= 19% * 424= 0.19 * 424= 80.56