A total of 408 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student tickets sold was two times the number of adult tickets sold. How many adult tickets were sold?

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Ok..So.. we will make this notation adult tickets= x and student tickets=y. It says that the number of student tickets was 2 times the number of adult tickets, so.. y=2x. x+y=408 (the total number)=> x+2x=408. 3x=408 => x=408/3 => x=136. (the number of adult tickets)

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