SOLUTION: which numberrs are exactly 2 times the sum of their digits
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Question 350575: which numberrs are exactly 2 times the sum of their digits
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Hi,
Note: Let td represent a 2 digit number. Then (10*t + d) is the value of the number.
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Write as You Read
(10*t + d) = 2(t + d)
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simplifying
10*t + d = 2t + 2d
8*t = d
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If t =1, then d=8 for example
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18 is exactly 2 times the sum of its digits
2(1 + 8)= 18
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