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Dom notices that each time the temperature goes up 10 degrees in Celsius, the temperature in Fahrenheit increases by 18 degrees. On Saturday, he sees the temperature went up by 5 degrees Fahrenheit. By how many degrees Celsius did the temperature rise?

A) 2.5°C
B) 5°C
C) 10°C
D) 15°C

Answer :

The temperature rose by 2.5°C. (Option a)

To find the change in Celsius temperature corresponding to a 5°F increase in Fahrenheit, we utilize the given relationship: for every 10°C increase in Celsius, there is an 18°F increase in Fahrenheit.

1. Conversion Factor: We first determine the ratio of change in Celsius to change in Fahrenheit. Given: 10°C = 18°F. Thus, [tex]\(1°C = \frac{18}{10}°F = \frac{9}{5}°F\).[/tex]

2. Given Change in Fahrenheit: Dom observed a 5°F increase in Fahrenheit temperature.

3. Change in Celsius: To find the change in Celsius temperature corresponding to a 5°F increase in Fahrenheit, we use the conversion factor:

[tex]\[5°F \times \frac{1°C}{\frac{9}{5}°F} = 5°F \times \frac{5}{9} = \frac{25}{9}°C\][/tex]

4. Simplification: [tex]\( \frac{25}{9}°C \)[/tex] is approximately [tex]\(2.777...°C\).[/tex]

5. Rounding: Rounding[tex]\(2.777...°C\)[/tex] to the nearest whole number, we get [tex]\(2.5°C\).[/tex]

Therefore, the temperature rose by 2.5°C, corresponding to option (a).

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