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a concert has tickets for sale. student tickets cost $3.50 and adult tickets cost $5.50. If 30 tickets were sold for a total of $145, how many of each type was sold?
(help me with number 4 too maybe?)

a concert has tickets for sale student tickets cost 350 and adult tickets cost 550 If 30 tickets were sold for a total of 145 how many of each type was soldhelp class=