x - wiek Andrzeja
75% z x - wiek Grzegorza
x - 6 - wiek Kacpra
x+75% z x + x - 6= 36
x + 3/4x + x -6=36
2 i 3/4 x=42
11/4x=42 /*4
11x=168
x=ok. 15
3/4*15=45/3=ok. 12
15-6=9
15+12+9=36
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x+75% z x + x - 6= 36
x + 3/4x + x -6=36
2 i 3/4 x=42
11/4x=42 /*4
11x=168
x=ok. 15
3/4*15=45/3=ok. 12
15-6=9
15+12+9=36