Oddman answered Multiples of 7 less than 40 are 7, 14, 21, 28, 35Only 35 has a sum-of-digits that is 8.
Anonymous answered 0+8, 1+7, 2+6, 3+4 are all sums of 81x7 could be consideredwouldn't that mean 1 is the answer, since it too is less than 40????