Suppose: 1) Va is the voltage across the series 2 and 6 ohm resistances, and Vb is the voltage across the 5 ohm resistor 2) Voltage on the rightmost node that branches out in three branches is Vi. Can you express Va and Vb as functions of Vi? If two resistors are connected in series, what happens to the voltage across each one of them? Does the value change with changing values of the resistances? After you find Va and Vb in terms of Vi, the difference between the two is what the meter reads. But, how on earth will you determine what Vi is? Well, think about the circuit as a closed loop, if you know the loop current can you use it to find Vi? Hope these hints are helpful.