Răspuns :
a+b+c = 140
b = 4a => a= b/4
b = 2c => c= b/2
b/4 + b + b/2 = 140
b+4a+2b = 560
7b = 560
b= 80
a= 20
c= 40
b = 4a => a= b/4
b = 2c => c= b/2
b/4 + b + b/2 = 140
b+4a+2b = 560
7b = 560
b= 80
a= 20
c= 40
a=/---/
b=/---/---/---/---/
c=/---/---/
140:7=20 --> a=20
b=4x20=80
c=2x20=40
proba 20+80+40=140
b=/---/---/---/---/
c=/---/---/
140:7=20 --> a=20
b=4x20=80
c=2x20=40
proba 20+80+40=140