Question 1521
So lets find out how many CD did he moved
It will be 1/3 times 2/3 because only 2/3 of the 1/3 are moved
(1/3)(2/3) = 2/9
So 2/9 is the total fraction of CD he moved, so there are 1-(2/9) which is also equal to 7/9 of CDs left