9 and 15 both go into 45.
Example:
9,18,27,36,45
15,30,45
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The couculator will show 9.2. But you round it up to 8 for a full number.
Only 9 and 15 are odd so the rest can be rejected. 9 is not a triangular number so only 15 is odd and a triangular number.
Let the number be x and if 9+2x = 15 then x equals 3
6 times... with a remainder of 9.
15