Adding and Subtracting!

I have 20/20ths popcorn if I eat 3/20ths and my friend eats 6/20ths how much would i have left?

sweetarsts have 10/20s and butterfingers also has 10/20s is we add that togather then we will get 20/20ths and it would fill a whole box.
I have 10/10 of a Hersheys Chocolate bar if I eat 3/10ths and my friend brings 2/10yths how much chocolate will I have.

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