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?
First, we need to find the total number of marbles Rebecca has. She has 10 eggs and 20 marbles, so she has a total of 30 marbles. 

Next, we need to find the number of groups of 4 marbles that can be created. We can divide 30 by 4 to find this out. 30 divided by 4 is the same as 30/4, which is equal to 7.5. This means that Rebecca can create 7 groups of 4 marbles. 

However, since she cannot have a fraction of a group, she will only be able to create 7 groups. 

Therefore the answer (numeric) is: 

7