SOLUTION: Let x be a two-digit number. If the sum of the digits of x is 9, then the sum of the digits of the number (x+10) is ?

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Question 1125047: Let x be a two-digit number. If the sum of the digits of x is 9, then the sum of the digits of the number (x+10) is ?
Found 2 solutions by math_helper, MathTherapy:
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
If x=10a+b is the number (x<90) and a+b=9, then x + 10 = (10a+b) + 10 = 10(a+1)+b and a+1+b adds to +highlight%28+10+%29+
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If x=90, you get sum of digits (100) = 1

Sum of digits =


Answer by MathTherapy(10557) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be a two-digit number. If the sum of the digits of x is 9, then the sum of the digits of the number (x+10) is ?