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6
No factor of 9 has three digits. 450 is a three-digit multiple of 150 (and of 9) with a digit sum of 9.
No.
15
6
That would be 6.
450 or 900
150
the sum of my digits is 6? answer=60
Add the digits together. The sum of the digits of 23 is 5.
sum of 150 what? first 150 numbers?
The sum of the digits is also a multiple of 9. And, if the sum of the digits is too large, you can sum those digits and keep going.