Final answer:
The total resistance of the circuit is 350 Ω.
Step-by-step explanation:
In order to find the total resistance of the circuit, we need to add the resistances of the two lamps. The resistances given are 125 Ω and 225 Ω. When resistors are in series, their total resistance is the sum of their individual resistances.
So, total resistance (R) = resistance of lamp 1 + resistance of lamp 2 = 125 Ω + 225 Ω = 350 Ω.
Therefore, the total resistance of the circuit is 350 Ω.