Question

Mama a cumparat 7 paini si 3 cozonaci , de acelasi fel , cu 53 lei. Apoi a cumparat , la aceleasi preturi , 2 paini si 6 cozonaci cu 82 lei. Cati lei costa o paine si cati lei costa un cozonac ? Va rog prin metoda comparatiei !

Answer 1

7p--------3c------53lei
2p--------6c------72lei

2*7. 2*3. 2*53
14p---------6c-------106lei
2p----------6c--------82lei
aflam cate paini sunto in plus
14p-2p=12p
aflam cat costa 12 paini
106-82=24lei
aflam cat costa o paine
24:12=2lei
aflam cat costa 7 paini
7*2=14lei
aflam cat costa 3 cozonaci
53-14=39lei
aflam cat costa un cozonac
39:3=13lei


2*7p------13*3c------53lei
2*2p------13*6c-------82lei