If C is the temperature in degrees Celsins and F is the temperature in degrees Fahrenheit, then the relationship between temperatures on the two scales is expressed by the equation 9C=5(F-32). In two sets of experiment, the temperature recorded for a chemical reaction to complete differed by 40 degrees on the Fahrenheit scale, by how many degrees did the temperature extremes differ on the Celsius scale? Pick one:
A) a) 65/9	B) b) 13	C) c) 22	D) d) 45	E) e) 81
The relationship is 9/5 - 32, so approximately half of difference in Celsius (the -32 part won't be used in this case).   Just looking at the answer choices you can pick C which is the only number near half of 40. The other answer choices are too far apart so no need to calculate.
<result>C</result>
If C is the temperature in degrees Celsins and F is the temperature in degrees Fahrenheit, then the relationship between temperatures on the two scales is expressed by the equation 9C=5(F-32). In two sets of experiment, the temperature recorded for a chemical reaction to complete differed by 40 degrees on the Fahrenheit scale, by how many degrees did the temperature extremes differ on the Celsius scale?