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K - wiek Kasi
J - wiek Joli
J = E
3K = E
K + 8 = J
3K = E
K + 8 = E
K + 8 = 3K
2K = 8
K = 4
Kasia ma 4 lata
Ela = 3x
Jola = x + 8
Jeżeli Ela i Jola są bliźniaczkami to ich wiek jest równy
3x = x+8
2x=8
x=4
Odp; Kasia ma 4 lata