: The sum of the digits of a two digit number is subtracted from the original number. The new number must be divisible by which of the following numbers?
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suppose two digit number is 10a +b
sum of digit is a+ b
10a+b-a-b = 9a
so the new number is divisible by 9..
sum of digit is a+ b
10a+b-a-b = 9a
so the new number is divisible by 9..
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