Rebecca wants to split a collection of marbles into groups of w. Rebecca has x eggs and y marbles. How many groups will be created?
First, we need to figure out how many marbles are in each group. 
There are w marbles in each group. 

Second, we need to figure out how many groups there are in total. 
There are y groups in total. 

Now, we can put these two pieces of information together to figure out how many groups Rebecca will create. 
There are x groups in total.