Question
At a shop, Alice paid $21 for 7 items: 3 rulers and 4 folders. The total cost of 3 rulers is $9 more than the total cost of 4 folders. How much did 1 ruler cost?
4 m

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At a shop, Alice paid $21 for 7 items: 3 rulers and 4 folders. The total cost of 3 rulers is $9 more than the total cost of 4 folders. How much did 1 ruler cost?