Răspuns :
a+b+c=640
b=2a
c=b+140
a+2a+b+140=640
3a+2a+140=640
5a=640-140
a=500:5
a=100
b=100*2
b=200
c=200+140
c=340
sper ca te-am ajutat
b=2a
c=b+140
a+2a+b+140=640
3a+2a+140=640
5a=640-140
a=500:5
a=100
b=100*2
b=200
c=200+140
c=340
sper ca te-am ajutat
a+b+c=640
b=2a
b=c-140
a=b:2
c=b+140
b:2+b+b+140=640
b:2+2b=640-140
b:2+2b=500
b+4b=500x2
5b=1000
b=1000:5
b=200
a=200:2=100
c=200+140=340
Nr.sunt
a=100
b=200
c=340
b=2a
b=c-140
a=b:2
c=b+140
b:2+b+b+140=640
b:2+2b=640-140
b:2+2b=500
b+4b=500x2
5b=1000
b=1000:5
b=200
a=200:2=100
c=200+140=340
Nr.sunt
a=100
b=200
c=340