RESPONSES to PUZZLE #6

Many got close to this, but did not finish.

Some did, and congrats go out to them!

If you are still working on it a few observations might help?

First notice that when you put 1oz. spoonful of milk in the 10oz. cup of coffee you have a ratio of 10 parts to 1 part which is 11oz. total, so 10/11^th is coffee and 1/11^th is milk.

Then if you mix it up and take a 1oz spoonful of this mixture you still have the same ratio, right?

So what fraction of this 1oz. spoonful is milk and what fraction is coffee?

Now add this to the 9oz. of milk and compute the exact amount of milk and coffee.

What is the ratio of the results?

Surprise!