Question

Beth used 7 pieces of paper to empty a twenty page notepad. Beth wants to know how many pieces of paper were previously used. Which of the following is a verbal model of this problem?

pieces of paper previously used plus pieces of paper used by Beth equals total pieces of paper originally in the notepad

total pieces of paper originally in the notepad plus pieces of paper previously used equals pieces of paper used by Beth

pieces of paper used by Beth plus total pieces of paper originally in the notepad equals pieces of paper previously used

pieces of paper used by Beth minus piece