Answer:
The answer depends on the arrangement of the batteries either parallel or series.
If the three batteries are connected in parallel, the voltmeter will read the same voltage as the individual battery (I.e, the combine voltage will remain 1.5 Bolts)
While
If the batteries are connected in series, and are correctly connected together from positive to negative, the combine voltages will increase by adding individual battery voltage together. So for three 1.5 Volts batteries, the total voltages will be 4.5 Volts.
Step-by-step explanation:
Parallel connected
Vp = 1.5 Volts
Series connection
Vs = 1.5 + 1.5 + 1.5 = 4.5Volts