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write a real-world situation that can be modeled by the inequality 20x>30+15x

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A costco (or sam's club or BJ's) membership costs $30. Paper towels cost $20 at Target, and $15 at costco. How many paper towels would you need to buy to make it more expensive to buy at Target?
catxfish
Joseph has 30 cakes. Mindy has 15x, how much is x if Joseph and Mindy's cakes are no more that 20x? 

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