Răspuns :
A+B+C+D=26
A=B:3⇒B=3A
A=C
D=6
A+3A+A+6=26
5A=26-6
5A=20
A=4
C=4
B=12
A=B:3⇒B=3A
A=C
D=6
A+3A+A+6=26
5A=26-6
5A=20
A=4
C=4
B=12
a+b+c+d=26
a=1/3b
c=a
d=6
1/3b+b+1/3b+6=26
b/3+3b/3+b/3+6=26
5b/3=26-6
5b=20×3
b=60:5
b=12
a=c=12/3=4