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0,75 razy a razy 42,5=1530
31,875 a=1530
a=48
dlugosc dzialki 48 m
x -100% x=1530*100% / 75%
x=153000 / 75
x=2040
P=a*b
2040=42,5*b
b=2040 /42,5
b=48
Odp:Dlugosc wynosi 48metrow