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c-ciastka 6,90-0,30= 6,60
2p+3c=6,90 *3
3p+2c=6,60 *-2
6p+9c=20,70
-6p-4c=-13,20
5c=7,50:5
c=1,5
2p+3c*1,5=6,90
2p+4,50=6,90-4,50
2p=2,40:2
p=1,20
18:1,20=15
odp: Agnieszka za 18 zł może kupić 15 pączków