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15 m * 20 m = 300 m2
Obliczam ile m2 ogrodu zostawiła sobie Zosia
300 m2 - 0,1 * 300m2=
= 300 m2 - 30 m2=
= 270 m2
Odp. Zosia pozostawiła sobie 270 m2 ogródka.