Answer:
50 V
Explanation:
If A, B, and C are identical, so we assume that all of the lamps have same resistance R. So, the voltage for each lamp is easy to calculate:
[tex]V=3V_{A}\rightarrow 150 = 3V_{A} \rightarrow V_{A}=50[/tex] volts
[tex]V_{A}[/tex] indicates the voltage of each lamp.