The weight of the jug when empty will be 150 grams.
The relationship between the weight of the jug and volume of water can be expressed as :
1/5 full = 250 grams
4/5 full = 550 grams
Change in weight of jug :
4/5 - 1/5 = (550 - 250) grams
3/5 = 300 grams
This means that 1/5 grams of fluid in the jug is :
300 grams ÷ 3 = 100 grams
The weight of the jug when empty would be ::
Weight when 1/5 full - Weight of 1/5 or fluid in the jug
250 g - 100 g = 150 grams
Therefore, the weight of the empty Jug is 150 grams.
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