Aflati suma a+b+c,stiind ca b=a×7 ,c=b-13, iar numarul" a" are valoarea9 .

Răspuns :

b=9x7=63
c=63-13=50
9+63+50=122
a+b+c=?
A=9
B=A×7
C=B-13
B=9×7
B=63
C=63-13
C=50
9+63+50=122