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S.o.d . of s.o.d ,,, (Posted on 2012-02-21) Difficulty: 2 of 5
Given a 2011 digit number, divisible by 9.
Let x be the sum of its digits and y the sum of the digits of x.

Find z, sum of the digits of y .

See The Solution Submitted by Ady TZIDON    
Rating: 4.0000 (2 votes)

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Some Thoughts maximum value of y | Comment 3 of 4 |
x, as previously noted, is between 9 and 18099

y, however, can be as high as 36, if x = 9999.  Previous posts do not mention any y values greater than 27.

This does not change z, which still must be 9. 

  Posted by Steve Herman on 2012-02-21 18:06:21
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