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A.10 B.20 C.15 D.22
Albert ma lat 20 lat.
2x+ x
2x+x+20
2*20+20=40+20=60 60-40=20
Odp. B
k - wiek Kamila
2a = k
a + k = k + 20
2a = k
a = 20
k = 40
Albert ma 20 lat.