Asia jest o 5 lat starsza od Kuby . Za 3 lata będą mieli razem 35 lat . Oblicz ile lat ma Asia a ile Kuba .
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a-wiek Asi
k-wiek Kuby
a=k+5
a+3+k+3=35
a=k+5
a+k=29
a=k+5
k+5+k=29
a=k+5
2k=24
k=12
a=17
35 - 5 = 30
30 / 2 = 15 wiek Kuby
Wiek asi= 15 + 3 = 18