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UPSC 2003: Four different candles, which can last for 5 hours, 4 hours, 3 hours and 2 hours of burning, respectively, are lit in a room at the same instant and allowed to burn till such time that the three candles in the room get extinguished. The cost of burning each one of these candles is 75 paise per hour. The cost involved is:
(a)Rs. 2.75
(b)Rs. 3.75
(c)Rs. 9.75
(d)Rs. 12.50
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Not attemptedCorrect Answer: (c) Rs. 9.75
The candles burn until the third one (4-hour candle) goes out, i.e., for 4 hours. Burn-time used: 4 h (5-h candle) + 4 h (4-h) + 3 h (3-h) + 2 h (2-h) = 13 h. At 75 paise per hour, cost = 13 × 0.75 = Rs 9.75, matching option (c). ([selfstudyhistory.com](https://selfstudyhistory.com/2015/01/22/gs-prelims-previous-years-question-paper-2003-part-3/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2003 Science & Technology question?▼
The correct answer is option (c): Rs. 9.75. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Logical Reasoning & Puzzles question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2003, GS Paper 1, as Question 57. It falls under Science & Technology > Logical Reasoning & Puzzles.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Logical Reasoning & Puzzles?▼
UPSC has asked 71 questions from Logical Reasoning & Puzzles (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.