Question 770469
If {{{ t }}} = tens digit, and
{{{ u }}} = units digit, then
{{{ u = t + 3 }}}
The tens digit can't be negative, so
{{{ u = 0 }}} is not allowed
{{{ u = 1 }}} is not allowed
{{{ u = 2 }}} is not allowed
Also, the tens digit can't be {{{ 0 }}}, so
{{{ u = 3 }}} is not allowed
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The numbers I'm left with that 
satisfy the equation are:
14
25
36
47
58
69
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The 2nd part says:
{{{ 10t + u + 27 = 10u + t }}}
( note that {{{ 10t + u }}} is the actual value of the number )
{{{ 10u - u - 10t + t = 27 }}}
{{{ 9u - 9t = 27 }}}
{{{ u - t = 3 }}}
{{{ u = t + 3 }}}
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This is telling me that all the 
numbers I wrote down satisfies
this condition
I will check that
{{{ 14 + 27 = 41 }}}
{{{ 41 = 41 }}}
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{{{ 25 + 27 = 52 }}}
{{{ 52 = 52 }}}
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{{{ 36 + 27 = 63 }}}
{{{ 63 = 63 }}}
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You can check the rest