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UPSC 2008: Carpenter A can make a chair in 6 hours, carpenter B in 7 hours and carpenter C in 8 hours. If each carpenter works for 8 hours per day, how many chairs will be made in 21 days?
(a)61
(b)67
(c)73
(d)79
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Not attemptedCorrect Answer: (c) 73
Rates: A = 1/6, B = 1/7, C = 1/8 chairs per hour. In 8 h they make 8(1/6 + 1/7 + 1/8) = 73/21 chairs per day. Over 21 days: 21·(73/21) = 73 chairs. ([jagranjosh.com](https://www.jagranjosh.com/articles/upsc-ias-previous-year-question-paper-1307733606-1?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2008 Science & Technology question?▼
The correct answer is option (c): 73. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Quantitative Aptitude question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2008, GS Paper 1, as Question 4. It falls under Science & Technology > Quantitative Aptitude.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Quantitative Aptitude?▼
UPSC has asked 178 questions from Quantitative Aptitude (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.