Question 929290
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Without algebra:
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a  number consist of two digits of which ten's digit eceeds the unit digit by 7.
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So it's either 70, 81 or 92
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the numbers itself is equal to 10 times the sum of digits.find the number.
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So it's 70 since 7+0=7 and 10 times 7 is 70.
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With algebra:

{{{system(
t = u+10,
10t+u = 10(t+u))}}}

Solve that and get t=7, u=0

Edwin</pre>