It is already given in the question that that freezing temperature of water is 0 degree Celsius. The freezing temperature of water in degree Fahrenheit is required to be found.
We know the relation between degree centigrade and degree Fahrenheit is"
Degree Fahrenheit = C(9/5) + 32
Here in the above equation "C" represents degree centigrade.
From the question we already know the freezing temperature of water as 0 degree Centigrade. Now we have to replace the value of Centigrade in the equation
Degree Fahrenheit = C(9/5) + 32
= 0(9/5) + 32
= 0 + 32
= 32 degrees
So water freezes at 32 degrees Fahrenheit.