The bananas in Philip's collection are organized into w groups. If there are a total of x bananas in Philip's banana collection How big is each group?
There are w groups of bananas. 
There are x bananas in Philip's banana collection. 

Each group has the same number of bananas. 

Let's denote the number of bananas in each group as y. 

Then, we have the following equation:

y * w = x

y = x / w