You have 3 unmarked pitchers that hold 6 cups, 10 cups, and 15 cups. The 10 cup pitcher is filled with lemonade, but you have to dilute it so people at the party don't complain that it's too sour. Unfortunately, I have, in the name of logic, broken your only measuring cup.
How can you dilute the lemonade to 20 cups such that all of the lemonade is of equal concentration? You have a sink with unlimited water, but you can't waste any lemonade. Try using as few moves as possible.
(In reply to
Solution by Penny)
You could skip step (8) and pour the 6 cup pitcher into the 15 cup pitcher directly after (7). That would be only 8 moves, which is as efficient as my solution or mike's, and without marking up your pitchers. Good job Penny.
re: Solution
