AB° Celsius ≅ BA° Fahrenheit
2*CD° Celsius ≅ DC° Fahrenheit

How much is A+B+C+D?

Rem: XY denotes 10*X+Y

F = 9/5*C-32
For both to be integers C must be a multiple of 5.  To be two digits then F must begin with 5.
15 degrees C = 59 degrees F.  Which doesn't fit. 

Likewise with the second equation.
2*15 degrees C = 86 degrees F.  Which doesn't fit. 

Is this problem possible or am I missing something?

Posted by Jer on 2015-09-14 13:38:23