To convert a Fahrenheit temperature into Celsius:

T(C) = (5/9)*(T(F)-32)

For example, to convert a Fahrenheit temperature of 98.6°F into degrees Celsius, first subtract 32 from the Fahrenheit temperature to get 66.6. Then you multiply 66.6 by five-ninths to get 37°C.

To convert a Celsius temperature into degrees Fahrenheit:

T(F) = ((9/5)*T(C))+32

For example, to convert a Celsius temperature of 100 into degrees Fahrenheit, first multiply the Celsius temperature reading by nine-fifths to get 180. Then add 32 to 180 and get 212°F.

The Celsius temperature scale is still sometimes referred to as the “centigrade” scale. Centigrade means “consisting of or divided into 100 degrees.” The Swedish Astronomer Andres Celsius (1701-1744) developed the centigrade scales for scientific purposes. It has 100 degrees between the freezing point (0°C) and boiling point (100°C) of pure water at sea-level air pressure. An international conference on weights and measures voted to name the centigrade scale after its inventor in 1948.

c=5(f-32)/9

fahrenheit to celcius

f=9c/5 +32

Using the second of the two formulas you can solve your problem as follows:

(9)(50)/5 +32=90+32=122 degrees F

if so quick way

double Celsius take away 10% add 32

50

100-10=90

90 plus 32=122