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1 h - 15 m²
x - ilosc godzin
y - pomalowana powierzchnia
y=15*x
2.
s=v*t
y=t
x=v
s=300
y*x = 300
y = 300/x
y = 30
Wzór: 2 * x = y
2 y = 3 godziny
x = 100
Wzór: 300 : y = x