Question
Mark was supposed to arrange some chairs for a concert in the school hall. If he formed 12 rows of 7 chairs, he would be left with 7 remaining chairs. How many more chairs would he need in order to form 15 rows of 11 chairs?
4 m

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Mark was supposed to arrange some chairs for a concert in the school hall. If he formed 12 rows of 7 chairs, he would be left with 7 remaining chairs. How many more chairs would he need in order to form 15 rows of 11 chairs?