Mathematics, 17.11.2020 23:10, ematthews1058

there are 23 tables in the library. each table has 4 chairs. 3rd graders sit in all the chairs at 3 tables. fourth graders sit in all the chairs at 6 tables the rest are empty

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there are 23 tables in the library. each table has 4 chairs. 3rd graders sit in all the chairs at 3...