4 rochii....5 costume....23 m stofă | × 2
7 rochii....10 costume....44 m stofă
8 rochii....10 costume....46 m stofă
7 rochii....10 costume.....44 m stofă
1 rochie....----------------....2 m stofă
4 × 2 = 8 m stofă....5 costume.....23 m stofă
5 costume....23 - 8 = 15 m stofă
1 costum....15 : 5 = 3 m stofă