Positive side of the 10 V battery is joined to a 10 Ohm resistor that is joined in series to a 20 Ohm resistor which closes the circuit with the negative terminal of the battery. The positive lead of voltmeter is situated on the battery side of the 10 Ohm resistor, and the negative voltmeter lead is situated on the common junction of the resistors. Determine what does the voltmeter display (answer must be in volts)?