Question 279490
t and u
tens digit and units digit
Find the number, 10t+u.


{{{system(t+u=12,36+10t+u=t+10u)}}}


{{{system(t+u=12,9t-9u=-36)}}}


{{{system(t+u=12,u-t=4)}}}


{{{system(t+u=12,-t+u=4)}}}

If add those, then find {{{u=8}}}; and find from that, {{{t=4}}}.


The requested two digit number, {{{highlight(48)}}}