Physics--If you're given one resistance, can you determine the second

Here's the problem:

In the series circuit (there's a pic that I obviously can't draw), if the current through R1 is 1.5 A, what is the current through R2?

I have the equation I=V/R, but I don't think that I have enough information to solve the problem. Could this be right?

In a SERIES circuit the current must be that same at all points.
So the current through R2 is identical to that through R1
ie it is 1.5A

V=IR is not needed in this problem.

for series circuits the equivalent resistance is R=R1+R2. .
Now to determine R1 or R2, you should be given the value of I and V
Then with R=V/I, find out the R, the equivalent resistance,
Then simply input it in the 1st formula and you'll get either of the resistors if one is given. .
But if I and V not given then the problem can't be solved.

But here's a trick too. . For series circuits the current is same through both of the resistors, so if the problem regards only current throug the 2nd resistor then you simply put the main current I as your answer that is 1.5 amp

In a series circuit, all the current through R1 is also through R2.
You don't need the value of R2. The current is the same.