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OpenStudy (anonymous):
Find the missing digit to make 18,59_ divisible by 9
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OpenStudy (experimentx):
4
OpenStudy (anonymous):
1 + 8 = 9, toss it out toss out the other 9 that leaves 5 solve 5 + ? = 9 get 4
OpenStudy (experimentx):
1+8+5+9+x must be divisible by 9
OpenStudy (anonymous):
procedure called "casting out nines"
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