Răspuns :
a+b+c+d=350
a=2b
d=a =>d=2b
2b+b+c+2b=350
5b+c=350
c=350-5b
a+b+c+d=350
2b+b+350-5b+2b=350
a=2b
d=a =>d=2b
2b+b+c+2b=350
5b+c=350
c=350-5b
a+b+c+d=350
2b+b+350-5b+2b=350
a+b+c+d=350
a=2b
c=350-5b
d=a
2b+b+350-5b+2b=350
5b+350-5b=350
10b=350
=> a=70
b=35
c=175
d=70
a=2b
c=350-5b
d=a
2b+b+350-5b+2b=350
5b+350-5b=350
10b=350
=> a=70
b=35
c=175
d=70