The table shows the ingredients for one batch of barbecue sauce. Anne has 9 cups of ketchup and makes the greatest number of whole batches of barbecue sauce possible. How much ketchup remains?
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Ingredients Amount
Brown Sugar 1/4 c
Cider Vinegar 1/2 c
Ground Cumin 1 tsp
Ketchup 2/3 c
Pepper 1 tsp