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A centrigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 185⁰ F . What is the fall in temperature as registered by the Centigrade thermometer

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20⁰ C

80⁰ C

15⁰ C

60⁰ C

answer is B.

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Detailed Solution

$\frac{C}{100} = \frac{F - 32}{180}$

$\Rightarrow C = \frac{185 - 32}{180} \times 100 = 85^{o} C$

$\Rightarrow ∆ C = 100 - 85 = 15^{0} C$

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