Question

Daca
A+B=27 si B+C=7
Sa se calculeze 3A+5B+2C

Answer 1

   
$\text{Hai sa folosim litere mici !} \\ \\ a+b=27 \\ b+c=7 \\ 3a+5b+2c= \\ =3a+3b+2b+2c= \\ =3(a+b)+2(b+c)= \\ =3*27 + 2*7 = 81+14 = \boxed{95}$