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Ilość kaset Basi: x
Ilość kaset Ani: x + 40%x = x + 0,4x = 1,4x
oraz
Ilość kaset Ani: 70 - 40%*70 = 70 - 28 = 42
stąd
1,4x = 42 /:1,4
x = 30
Odp. Ania ma 42 kasety, a Basia 30.