25 and 20
25 + 20 = 45
25 - 20 = 5
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45 and 45/5 = 9
25 and 20 25 + 20 = 45 25 - 20 = 5
The sum of 45 and 246 is 291.
the only multiples of 5 are 30.35.40.45.50, and 55 the only sum to 9 is 45
It isthe number must end in 0 or 5, andthe sum of the digits (and the sum of the digits of that sum and so on), must be 9.