if I had a cookie and i ate 1/23 of it and my friend ate 2/3 of it, how much cookie would I have left?
1 cookie - 1/23 cookie - 2/3 cookie
69/69 cookie - 3/69 cookie - 46/69 cookie
(69 - 3 - 46)/69 cookie
20/69 cookie, or about 0.29 cookie
