19 camasi........7 rochii.........59 m
15 camasi........7 rochii.........51 m
________________________ ( - )
4 camasi............//...................8 m
Aflam cati m sunt necesari ptr o camasa
8 : 4 = 2 m
Aflam cati m sunt necesari ptr 19 camasi
19×2 = 38 m
Aflam cati m sunt necesari ptr o rochie
(59 - 38) : 7 = 21 : 7 = 3 m