Grandfather gathered fresh mushrooms. The fifth was wormwood, and it was thrown away, the other dried up. He obtained 720 grams of dried mushrooms. How many kilograms did the grandfather collect, and by drying the mushrooms they lost 75% of their weight?

Correct result:

x =  3.6 kg


(x-x/5)•(1-75/100) = 720 / 1000

200x = 720

x = 18/5 = 3.6

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