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Question:
A solution is to be kept between 68 degree F and 77 degree F. What is the range in temperature in degree Celsius (C) if the Celsius / Fahrenheit (F) conversion formula is given by F=9/5 C+32?
Answer:

Given F = C*9/5 + 32

=> F-32 = C*9/5

=> C = {5*(F-32)}/9 .............1 

Now put F = 68 in equation 1, we get

      C = {5*(68-32)}/9  

=> C =  (5*36)/9

=> C = 5*4

=> C = 20

Again put F = 77 in equation 1, we get

      C = {5*(77-32)}/9  

=> C =  (5*45)/9

=> C = 5*5

=> C = 25

So range of solution is kept it between 20° C and 25° C

        

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