Temperature at the foot of a mountain is +5∘C. It fell down by 10∘Cat the top of the mountain. The temperature recorded on the top is

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+15∘C

−15∘C

+5∘C

−5∘C

answer is D.

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Detailed Solution

Concept- The fact that the temperature in this case has decreased at the mountaintop requires us to deduct 10°C from the temperature at the mountain's base. The temperature at the mountain's summit is therefore 10 degrees colder than it is at its base.
Both negative and positive temperatures are possible. Positive and negative temperatures correspond to hot and cold, respectively. As with 0 on the number line between positive and negative integers, zero temperature is regarded as a neutral point between positive and negative temperatures. The symbol for temperature, C, stands for Celsius.
Temperature at the mountain's base is

+ 5 ° C .

The temperature at the mountain's summit is 5 degrees Celsius (10 degrees Celsius) lower than it is at the mountain's summit.
Consequently, the top temperature is