x-szukana liczba
x+5%x+10%x=69
X+0,05x+0,1x=69
1,15x=69/:1,15
x=60
ODP.SZUKANA LICZBA TO 60
105%+10%---69
100%---x
105x+10X=6900
115x=6900/:115
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x-szukana liczba
x+5%x+10%x=69
X+0,05x+0,1x=69
1,15x=69/:1,15
x=60
ODP.SZUKANA LICZBA TO 60
105%+10%---69
100%---x
105x+10X=6900
115x=6900/:115
x=60