That the sum of its digits add up to 9 as for example 9*9 = 81 and 8+1 = 9
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There are infinitely many multiples of 9 and it is not possible to add them all.
9 18 = 9 27 =9 36 = 9 etc
the only multiples of 5 are 30.35.40.45.50, and 55 the only sum to 9 is 45
10. They are the first ten multiples of 9.
If half of the sum is 90 then the full sum must be 180. The three consecutive multiples of 10 which add up to 180 are 50, 60 and 70.