11. A cooling machine requires that room temperature
to be lowered from 50°C at the rate of 5°C every
hour. What will be the room temperature after 8
hours after process begins?
2. In a competitive examination, containing 24
questions, 5 marks are awarded for every correct
answer and (-2) marks are awarded for every
incorrect answer and 0 marks for questions not
attempted.
(a) David attempts 8 correct and 16 incorrect
answers. Find his score.
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Answer:
Explanation: Room temperature at the beginning of the process = 50oC
Rate of lowering the temperature = 5oC every hour
Temperature lowered after 8 hours= 5 × 8 = 40oC
Room temperature after 8 hours = 50oC - 40oC = 10oC
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