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If the digits '504' add to '9' , then it is multiple of '9'. , or '9' is a factor'.

5+0+4 = 9

Hence 504 is a multiple of '9'

9)504 = 56 Ther answer!!!!

NB This is an arithmetic summation/factoring 'trick'.

e.g. 1125 also satisfied the rule

1+1+2+5 = 9

9)1125 - 125

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lenpollock

Lvl 17
19h ago

What else can I help you with?