At what temperature do both Centigrade and Fahrenheit thermometers show the same reading?

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RRB ASSISTANT LOCO PILOT (Allahabad) 2010 click here to view all questions

At what temperature do both Centigrade and Fahrenheit thermometers show the same reading?

A−20°

B−40°

C42°

D0°

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Correct answer is: −40° Explanation: Let F is Fahrenheit and C is Celsius. The conversion formula is: $F = C \times \frac{9}{5} + 32$ given that F and C is equal. so, $F = F \times \frac{9}{5} +32$ $F- \frac{9F}{5} =32$ $\frac{5F-9F}{5}=32$ $\frac{-4F}{5}=32$ $-4F = 32 \times 5$ $F = - \frac{160}{4}$ $F = -40$ dinesh ? answered Dec 23 '2019 at 19:56 All Comments

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