If a cup of coffee has temperature 91°C in a room where the ambient air temperature is 22°C, then, according to Newton's Law of Cooling, the temperature of the coffee after $\displaystyle {t}$ minutes is $\displaystyle {T}{\left({t}\right)}={22}+{69}{e}^{{-{t}/{51}}}$. What is the average temperature of the coffee during the first 32 minutes?

average temp = °C