Sunday
April 20, 2014

Homework Help: Math

Posted by John on Tuesday, February 19, 2013 at 3:41am.

Let S(n) denote the sum of digits of the integer n. Over all positive integers, the minimum and maximum values of S(n)/S(5n) are X and Y, respectively. The value of X+Y can be written as a/b , where a and b are coprime positive integers. What is the value of a+b?

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