Working out ICopy from a current mirror [Mosfet]
Your formula is for one current mirror. You could use it to determine the current through the NMOS marked 2(W/L)n in the left circuit.

That current would then be 2/3 * Iref.

That same current is fed into a 2nd current mirror, the one with 2 PMOS transistors. Use the same formula again but note what the input current is: 2/3 Iref

The right schematic is slightly more complex but using the formula you can determine the currents through the NMOS marked 5(W/L)n and 3(W/L)n.

Then again solve the currents in the PMOS mirror.

At the output what happens to those 2 currents? Use the current law if you must.