The temperature at the foot of a mountain is +5∘C. It fell down by 10∘C at the top of the mountain. The temperature recorded on the top is:
+15∘C
−15∘C
+5∘C
−5∘C
A
−15∘C
B
+15∘C
C
+5∘C
D
−5∘C
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Solution
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It is given that the temperature at the foot of a mountain is +50C and it fell down by 100C at the top of the mountain which can be represented as −100C.
Adding both to find the temperature recorded on the top as follows:
(+5)+(−10)=5−10=−5
Hence, the temperature recorded on the top is −50C.
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