Question

At what temperature will the reading on a Celsius thermometer be the same as the that on a Fahrenheit thermometer?

(a) 0°
(b) 100°
(c) −40°
(d) 212°

Answer 1

(c) $-$40 ͦ
As calculated from the formula C= ($\frac{5}{9}$) (F$-$32), the temperature at which Celsius and Fahrenheit thermometer read the same is −40°.