THE RMI (Radio Magnetic Indicator) gives the magnetic bearing from the aircraft to the station.

It can display both VOR and ADF bearings; for VOR bearings use variation at the station for ADF bearings use variation at the aircraft.  

In this question the bearing to the station is 178ºM, variation at Lajes is 15ºW (taken from the chart), giving a true bearing of 163ºT and a bearing to plot from Lajes of 343ºT.

To plot this bearing line up your protractor with the nearest meridian through Lajes.

Having plotted the bearing, arc off 135nm (using the latitude scale: 1'lat. = 1nm, 135nm = 2¼º lat.).

This should give you something very close to 40º55'N 027º55'W.