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5kg*0,6 (grzyby robaczywe)
5kg - 5kg*0,6 (dobre grzyby)
5kg - 5kg*0,6 = 5kg - 3kg = 2kg
x - 40%
x = (5kg * 40%):100% =200kg :100= 2kg
odp. Dobrych bylo 2kg grzybów.
0.6*5=3kg masa zlych