Question 1101397
If a two-digit number's tens digit is three times the ones digit, and if the digits are interchanged, then the new number is 36 less than the original number.
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t, TENS
u, ONES
{{{t=3u}}}---------------from this the possible numbers come from 31, 62, 93; but none others.


{{{10t+u-(t+10u)=36}}}
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{{{9t-9u=36}}}
{{{t-u=4}}}
substitute;
{{{3u-u=4}}}
{{{2u=4}}}
{{{u=2}}}
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Original Number:    62