The amount of carrots Joey has left according to the task content is; 1.8kg.
It follows from the task content that the quantity of carrots he has initially is; 3 kg.
On this note, upon adding 0.8 kilograms of carrots to a pot of vegetable soup, and grated 400 grams of carrots = 0.4kg, it follows that the quantity of carrot left is;
= 3 - 0.8 - 0.4 = 1.8kg.
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