Answer:
There are 21 marbles in total.
Explanation:
Consider the provided information.
Fin has 7 bags of marbles each bag has 3 marbles .
We need to Show one way to break apart the seven to multiply them.
7 can be break in several ways, Let break 7 bags as 4 bags and 3 bags.
7 bags = 4 bags + 3 bags
Each bag has 3 marbles

Now distribute 3 inside the parentheses.



Hence, there are 21 marbles in total.