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A certain freezing process requires that room temperature be lowered from 4°C at the rate of 5°C every hour. What is the room temperature after 10 hours?

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0°C

-5°C

-10°C

-15°C

answer is C.

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Detailed Solution

Initial temperature of a room = 40°C
For 10 hours $\to 10 \times (- 5^{\circ} C) = - 50^{\circ} c$
After 10 hours $- 50^{\circ} c + 40^{\circ} C = - 10^{\circ} C$

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