Răspuns :
a - numarul la care ma gandesc
[tex]a+11-41=20=\ \textgreater \ a+11=20+41=\ \textgreater \ a+11=61=\ \textgreater \ [/tex][tex]=\ \textgreater \ a=61-11=\ \textgreater \ a=50[/tex]
[tex]a+11-41=20=\ \textgreater \ a+11=20+41=\ \textgreater \ a+11=61=\ \textgreater \ [/tex][tex]=\ \textgreater \ a=61-11=\ \textgreater \ a=50[/tex]