A bottle can hold 4 kg of alcohol, he can hold () kg of water at most (density alcohol = 0.8 times 10 to the third power kg / m3)
Bottle volume v = 4kg / 800kg / m3 = 0.005 M3
Because the water density is 1000kg / m3, 0.005 m3 multiplied by 1000kg / m3 equals 5kg
So he can hold (5) kilograms of water at most
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