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Q.

The temperature at 12 noon was 10°C above zero. If it decreases at a rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero? What would be the temperature at midnight?


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a

7

b

8

c

9

d

10  

answer is D.

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Detailed Solution

Tn=a+n-1d
-8=10+(n-1)(-2)
-18=n-1-2
n-1=9
n=10
 
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