## Elementary Technical Mathematics

$140^oF=60^oC.$
To change from degrees Fahrenheit to degrees Celsius, we use the formula $$C=\frac{5}{9}(F-32^o)=\frac{5}{9}(140^o-32^o)=\frac{5}{9}\times 108=60^o$$ that is $140^oF=60^oC.$