Question

a+b=5 si b+c=17
5a+10b+5c=?
REPEDE VA ROG

Answer 1

a+b=5
b+c=17
5a+10b+5c=
5x5+17x5=
25+85=110

Answer 2

[tex]a+b=5\ \textless \ =\ \textgreater \ a=5-b=\ \textgreater \ (5-b)+b=5=\ \textgreater \ 2b=10=\ \textgreater \ \\ b=5=\ \textgreater \ a+5=5=\ \textgreater \ a=5-5=\ \textgreater \ a=0\\ b+c=17\ \textless \ =\ \textgreater \ 5+c=17=\ \textgreater \ c=17-5=\ \textgreater \ c=12\\ 5a+10b+5c\ \textless \ =\ \textgreater \ 5*0+10*5+5*12=\ \textgreater \ \\ 0+50+60=\ \textgreater \ 0+110=110 [/tex]