Rebecca wants to split a collection of marbles into groups of 4. Rebecca has 10 eggs and 20 marbles. How many groups will be created?
There are 10 eggs and 20 marbles. 

There are 4 groups. 

There are 10 / 4 = 2.5 groups of eggs. 

There are 20 / 4 = 5 groups of marbles. 

There are 2.5 * 5 = 12.5 groups in total.