Three resistors in parallel have an equivalent resistance of 15 Ω . Two of the resistors have resistances of 30 Ω and 40 Ω.  What is the resistance of the third resistor?  Express your answer to two significant figures and include the appropriate units.

Physics for Scientists and Engineers: Foundations and Connections
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Chapter29: Direct Current (dc) Circuits
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Three resistors in parallel have an equivalent resistance of 15 Ω . Two of the resistors have resistances of 30 Ω and 40 Ω.  What is the resistance of the third resistor?  Express your answer to two significant figures and include the appropriate units.

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