To convert from Fahrenheit to Celsius, we can use the formula:
\[ C = \frac{5}{9} (F - 32) \]
Where \( C \) is the temperature in degrees Celsius and \( F \) is the temperature in degrees Fahrenheit.
Given \( F = 149^{\circ }F \), we can substitute this value into the formula:
\[ C = \frac{5}{9} (149 - 32) \]
First, calculate \( 149 - 32 \):
\[ 149 - 32 = 117 \]
Now substitute this back into the equation:
\[ C = \frac{5}{9} \times 117 \]
To multiply \( \frac{5}{9} \) by \( 117 \):
\[ C = \frac{5 \times 117}{9} = \frac{585}{9} \]
Now, we need to divide \( 585 \) by \( 9 \):
\[ 585 \div 9 = 65 \]
Thus, \( C = 65^{\circ }C\).
Therefore, the equivalent in Celsius of \( 149^{\circ }F \) is:
\[ \boxed{65^{\circ }C} \]
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