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AlecClevelandfb3236 ∙
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No factor of 9 has three digits. 450 is a three-digit multiple of 150 (and of 9) with a digit sum of 9.
9 100%=6 50%=6/2=3 150%=100%+50%=6+3=9
450 or 900
9% of 150 is 13.5