02-09-2016
Mathematics

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find the digit that makes _ 3520 by 9

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02-09-2016

Remember the divisibility rule for 9. The sum of the digits of the number must be divisible by nine.
Let the digit be [tex] x [/tex]. Then [tex]x+3+5+2+0=x+10[/tex] has to be divisible by nine. Recalling that [tex] 18=9*2 [/tex], we note that [tex] x=8 [/tex].

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