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12ar*1/40=0,3ar - powierzchnia chodnika
12ar-9,6ar-0,3ar=2,1ar
2,1ar=2,1ar+100m²=210m²
12a = 1200m²
pow. ogrodu: 1200m² * 80% = 960m²
pow. chodnika: 1200m² * 1/40 = 30m²
pow.domu: 1200m² - 960m² - 30m² = 210m²
x - 80%
x=9,6 a - ogród
12-9,6= 2,4a - dom i chodnik
12 * 1/40 =0.3a - chodnik
2,4 - 0.3= 2,1a -dom
2,1a = 210 m²
Odp. dom zajmuje 210 m².