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ewa 29 - 3 = 26
26 : 2 = 13
13 + 3 = 16 - lat ma ewa
edek ma 13 lat
13 - 3 = 10 - lata Ali
Liczę na naj
x + 3 - wiek Edka
x+3 + 3 - wiek Ewy
x+3+x+3+3 = 29
2x +9 =29 / -9
2x=20 /:2
x=10
Odp. Ala ma 10 lat.