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 (I think it's the most efficient) by Libby)
Problem is, though, the 15 cup pitcher will have 8.333 cups water to
6.666 cups concentrate, while the 6 cup pitcher will have 2 cups water
to 4 cups concentrate. The lemonade will be uneven.
re: solution (I think it's the most efficient)
