Question 1063388
t, TENS
u, ONES
{{{system(t+u=15,(1/3)(10t+u)-12=17)}}}



{{{(10t+u)/3=29}}}

{{{10t+u=3*29=87}}}

{{{u=87-10t}}}

--

Digit sum equation t+u=15
{{{t+87-10t=15}}}
{{{-9t=15-87}}}
{{{t=(87-15)/9}}}
{{{t=72/9}}}
{{{highlight(t=8)}}}


Number is 87