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a total of 440 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student tickets sold was three times the number of adult tickets sold. How many adult tickets were sold.

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Important:  represent your unknowns.  You might represent "number of adult tickets sold" by "a" and "number of student tickets sold" by "s."

How many tickets were sold, altogether?  Express this sum algebraically, using "a" and "s."

How does the number of student tickets sold compare with the number of adult tickets sold?  Express this algebraically in therms of "a" and "s."

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