Hi Officiallylilly!
So 207 students in 9 classes, how many are in 6 classes? OK this is easy to solve so we do 207/9 to find out how many is in one class which is 23 in one class. Ok so if 23 is one class now we need to find out how many is in 6 classes which all we do is 23*6 which is 138.
Hope this helps!
