Question

daca a+2*b=5si b+2*c=91 atunci calculati 5*a+13*b+6*c

Answer 1

5*a+13*b+6*c=5*a+10*b+3*b+6*c=5*(a+2*b)+3*(b+2*c)=5*5+3+91=25+273=298