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adoniseelqueen

first we will convert the cake's weight from kg to grams

 1kg = 1000 grams

 4kg = 4000 grams

he gave michael : 459 g

              Victor : 703 g

               Hailey : 682 g

Total : 465+703+682 = 1844 grams

Subtract the total weight of the slices from the total weight of the cake:

                4000 grams−1844 grams=2156 grams

so Joel has 2156 grams of cake left.

I hope you understand english is not my native language

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