To convert the temperature from Fahrenheit to Celsius, you can use the formula:
\[ C = \frac{5}{9}(F - 32) \]
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First, convert the initial temperature (120°F) to Celsius: \[ C_1 = \frac{5}{9}(120 - 32) = \frac{5}{9}(88) \approx 48.89^\circ C \]
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Next, convert the final temperature (60°F) to Celsius: \[ C_2 = \frac{5}{9}(60 - 32) = \frac{5}{9}(28) \approx 15.56^\circ C \]
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Now, find the drop in temperature in Celsius: \[ \text{Drop} = C_1 - C_2 \approx 48.89 - 15.56 \approx 33.33^\circ C \]
Based on the options provided, we can see that the closest answer to 33.33°C is 30°C.
So, the necessary drop in degrees Celsius is 30°C.