Maria jest 7 lat starsza od Kuby. Za 3 lata będzie 2 razy starsza od Kuby. Ile lat ma Kuba?
m- wiek marii
k- wiek Kuby
m=k+7
m+3=2k
k+7+3 =2k
10=k
m=10+7=17
Maria ma 17 lat a Kuba 10
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m- wiek marii
k- wiek Kuby
m=k+7
m+3=2k
k+7+3 =2k
10=k
m=10+7=17
Maria ma 17 lat a Kuba 10