3) Our school's art teacher took his class to a concert hall and paid $512 for 10 adult tickets and 9 children tickets. The next day, our music teacher took our class to the same concert hall and paid a total of $831 for 17 children and 15 adults. If a represents the price of an adult ticket, and c represents the price of a child's ticket, which system of equations can be used to find how much each child ticket and each adult ticket cost? A) 19ac-512 32ac-831 B) 10+9512 154+17c-83 10c+9a-512 15c+17a-83 D) 19(a+c)=512 32(a+c)-83

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