Răspuns :
a+b+c=588
b=3a
a=b:3
c=b+21
b:3+b+b+21=588
b:3+2b=588-21
b+6b=567x3
7b=1701
b=1701:7
b=243
a=243:3=81
c=243+21=264
81+243+264=588
b=3a
a=b:3
c=b+21
b:3+b+b+21=588
b:3+2b=588-21
b+6b=567x3
7b=1701
b=1701:7
b=243
a=243:3=81
c=243+21=264
81+243+264=588
a+b+c=588
b=3a
c=b+21⇒c=3a+21
a+3a+3a+21=588
7a=588-21
7a=567
a=81
b=3x81
b=243
c=243+21
c=264
b=3a
c=b+21⇒c=3a+21
a+3a+3a+21=588
7a=588-21
7a=567
a=81
b=3x81
b=243
c=243+21
c=264