Mathematics, 11.07.2019 20:30, sarahsteelman

Nikita borrows 1 superhero book and 1 dragon book from the library. the superhero book has a mass of 200 grams. the dragon book has a mass of 310 grams. what is the mass of the books nikita borrowed?

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Nikita borrows 1 superhero book and 1 dragon book from the library. the superhero book has a mass of...