Răspuns:
1. 1550-172= 1378 nr elevi (pleaca in sem 1)
1378+222= 1600 nr elevi (vin in sem 1)
1600-401= 1199 nr elevi (pleaca in sem 2)
1199+213=1412 nr elevi (vin in sem 2)
2. 54-21= 33 mere denisa
83-40= 53 covrigei denisa
42-26= 26 portocale Denisa