4 rochii ... 4 pantaloni ... 20 m stofă
4 rochii ... 8 pantaloni ... 28 m stofă
_____________________________
/ ... 4 pantaloni ... 8 m stofă
un pantalon = 8 : 4
un pantalon = 2 m stofă ☑
4 rochii + 4 x 2 m = 20 m
4 rochii + 8 m = 20 m
4 rochii = 20 - 8
4 rochii = 12 m
o rochie = 12 : 4
o rochie = 3 m ☑