Let's say that Lucia and Ben saved their money at the same time.
Together they saved a sum of $$3$.

If Lucia and Ben saved $$150$ up to this point and saved $$3$ each time, how many times did they have to save?
Try using division.

In this case, Lucia and Ben must have saved $50$ separate times.
We also know that each of the $50$ times, Lucia saved $$2$.
Using multiplication, can you now find how much Lucia saved on her own?

Lucia saved $$100$. Now do you know how much Ben saved?