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**Young's modulus problem -- need a hint**

There are two wires, one brass the other copper, both 50 cm long and 1.0 mm diameter. They are somehow connected to form a 1m length. A force is applied to both ends, resulting in a total length change of 0.5 mm. Given the respective young's moduluses of 1.3 x 10^11 and 1.0 x 10^11, I'm supposed to find the amount of length change in each section.

Apparently a variation of Hooke's law should be used here, such as F/A=Y(change in length/original length)

I'm stuck on how can I solve this with 2 unknowns (force and change in length)?

Regards