A series circuit consists of a 10 W resistor, a 20 W resistor, and a 30 W resistor. The circuit is connected to a 120 V source. If the voltage across the 10 W resistor measures 20 V and the voltage across the 30 W resistor measures 60 V, how much voltage should be measured across the 20 W resistor?
A. There is not enough information given to solve this problem.
B. 120 V
C. 40 V
D. 10 V
Answer: C
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