Answer
$15^{\circ}~C$
Work Step by Step
$C = \frac{5}{9}(F-32)$
We can use this formula to convert from Fahrenheit to Celsius. It is given in the question that $F = 59$ since the temperature on the Fahrenheit scale is $59^{\circ}~F$.
$C = \frac{5}{9}(F-32)$
$C = \frac{5}{9}(59-32)$
$C = \frac{5}{9}(27)$
$C = 15$
The temperature on the Celsius scale is $15^{\circ}~C$