Răspuns :
a |-----|-----|
b |-----| } 90
90 : 3 = 30 ( b)
30 x 2 = 60 (a)
Verificam : 60 +30 = 90.
b |-----| } 90
90 : 3 = 30 ( b)
30 x 2 = 60 (a)
Verificam : 60 +30 = 90.