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A family purchased tickets for a concert. They paid a total of $90 for 7 adult tickets and 12 child tickets. The price of a child ticket was two-thirds the price of an an adult ticket. How much was the price of an adult ticket?



Answer :

a is aldult tickets
b is child tickets

b = 2/3 a

7a + 12b = 90
7a + 12 x 2/3 a = 90
7a + 8a = 90
15a = 90
a = 6; b = 4

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