Question
Owen was supposed to arrange some chairs for a concert in the school hall. If he formed 13 rows of 7 chairs, he would be left with 9 remaining chairs. How many more chairs would he need in order to form 10 rows of 15 chairs?
4 m

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Owen was supposed to arrange some chairs for a concert in the school hall. If he formed 13 rows of 7 chairs, he would be left with 9 remaining chairs. How many more chairs would he need in order to form 10 rows of 15 chairs?