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3x - Tomek
3x + 16 - Kasia
x + 3x + 3x + 16 = 303 | - 16
7x = 287 |:7
x = 41 - Janek
41 × 3 = 123 - Tomek
123 + 16 = 139 - Kasia
;)
Janek- x
Kasia- 3x+16
3x+x+3x+16=303
7x+16=303 /-16
7x=287 /7
x=41
Janek-41
Tomek-123
Kasia- 139
Odp. Janek ma 41 samochodów, Tomek ma 123, a Kasia 139.
x-znaczki Janka
3x-znaczki Tomka
3x+16-znaczki Kasi
x+3x+3x+16=303
7x=303-16
7x=287/:7
x=41
Janek ma 41 znaczków,Tomek 3x=3*41=123,Kasia 3x+16=123+16=139
spr.41+123+139=303
odp.Janek ma 41 znaczków,Tomek 123,a Kasia 139.