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Question

The temperature at 12 noon was 10C above zero. If it decreases at the rate of 2 C per hour until midnight, what would be the temperature at 9 p.m.?

A
-8C
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B
-6C
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C
8C
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D
6C
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Solution

The correct option is A -8C
Given the temperature at 12 noon is 10C.
The temperature decreases at the rate of 2C per hour until midnight.
From 12 noon to 9 p.m, it is 9 hours.
Temperature decrease =9×(2C)=18C
Temperature at 9 p.m =10C+(18C)
=8C

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