You have an ideal mutual inductance ciruit and the circuit on the left contains a voltage source with value: 20<0 V an impedance 25+j1 ohms and an inductor Va and they are all in series with I1 as the current. On the right side, we have an inductor and a impedance 2+4i and another impedance 20<30 ohms and the voltage across it is V3. The ratio of the circuits are 2:5 from left to right respectively. We need to find I1, Va and V3 all in the phasor domain of this circuit.