Odpowiedzi

2010-04-08T13:10:33+02:00
X=ilość modeli janka
3x=ilosć modeli tomka
16+3x= ilosć modeli kasi

x+3x+3x+16=303
7x=303-16
7x=287
x=287:7
x=41
janek ma 41
tomek ma 3×41=123
kasia ma:123+16=139

spr, 41+123+139=303
2010-04-08T13:11:35+02:00
Janek - x
Tomek- x*3
KASIA- x*3 + 16

7x +16 = 303 | -16
7x = 287
x = 287 : 7
x = 41
Janek - 41
Tomek- 41*3 = 123
Kasia - 41*3 +16 = 123+16= 139