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Temperature dependence of resistivity

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A resistance thermometer uses a copper wire as the temperature sensor. The resistance of the wire is 50.0 Ω at ice-point and 69.0 Ω at steam-point.
What is the temperature measured by the thermometer if the resistance is measured at 55.0 Ω?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi