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y - wiek Edka
z - wiek Ewy
x = y + 3
z = y - 3
y + z = 29
z - y = -3
z + y = 29
2z = 26 /:13
z = 13
x = y + 3
z = y - 3
13 = y -3
y = 10
x = y + 3
x = 10 +3
x = 13
x =13
y = 10
z =13
x-wiek Ali
x+3- wiek Edka
(x+3)+3- wiek Ewy
x+3+x+3+3=29
2x+9=29
2x= 29 / -9
2x=20
x=20 / :2
x=1=
odp.: Ala ma 10 lat