If selling 2 cups of lemonade earned Janice $6, then the price of one cup of lemonade is $6/2 = $<<6/2=3>>3.
If selling 6 cups of lemonade cost $3 each to buy, then selling 6 cups of lemonade will earn her $3 * 6 = $<<3*6=18>>18. Answer: \boxed{18}.
Janice earned a total of $6 by selling 2 cups of lemonade. After selling a total of 6 cups of lemonade, how much money will Janice have made in all? Assume the relationship is directly proportional.
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