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x+5/100x(ułamek)+10/100x(ułamek)=69
115/100x(ułamek) =69 /razy 100
115x=6900 /podzielić na 115
x=60
5%x + x + 10%x = 69
0.05x + x + 0.1x = 69
1.15x = 69 / : 1.15
x = 3
Pozdrawiam :)
x+5%x+10%x=69
x+0,05x+0,1x=69
1,15x=69|:1,15
x=60
odp: Szukana liczba to 60