SOLUTION: A two digit number exceed twice the sum of digits by 7. Find the number if its ten digits is smaller than its unit digit also by 7.

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Question 1143963: A two digit number exceed twice the sum of digits by 7. Find the number if its ten digits is smaller than its unit digit also by 7.
Answer by josgarithmetic(39614) About Me  (Show Source):
You can put this solution on YOUR website!
system%2810t%2Bu-2%28t%2Bu%29=7%2Cu-t=7%29
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10t%2Bu-2t-2u=7
8t-u=7

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system%288t-u=7%2C-t%2Bu=7%29
ADD:
7t=14
highlight%28t=2%29-----------the TENS digit
highlight%28u=9%29----------the ONES digit