Can't tell unless you know the values of R1 and R2. You can't tell the current because you don't have the values of the resistors, which would therefore make attaining such a computation not practical. From the experiments in lab, I theorized that it is not possible to compare resistors unless the values or composition of the resistors are known. Resistors each resist currents at different levels. If you do not know the magnitude of resistor, you cannot compare it to the effects another resistor has on the same current.
Resistors have different values of resistance.
Even though the current goes through one first, and then the second, they still will resist the same amount. This will not be true however, if the resistors are different.