Răspuns :
Ioana /----/
} 15
Maria /----/+5
15 - 5 = 10
10 : 2 = 5
Ioana are 5 baloane
Maria are 5 + 5 = 10 baloane
} 15
Maria /----/+5
15 - 5 = 10
10 : 2 = 5
Ioana are 5 baloane
Maria are 5 + 5 = 10 baloane
15-5=10 baloane Maria
10-5=5 baloane Ioana
Verificare : 10+5=15 baloane
Coronița ?
10-5=5 baloane Ioana
Verificare : 10+5=15 baloane
Coronița ?