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9-9.

Since 2 cups of lemonade is twice as much as 1 cup of lemonade, to find the price of 1 cup of lemonade, you must half the price of 2 cups of lemonade.

You can also solve the problem by setting a proportion equation like the one below, then solve for x.

To find the price of any amount of lemonade, in the equation above substitute ''1 cup of lemonade'' with the number of lemonades you are looking for.