Staff Selection Commission Quantitative Aptitude — Question 268
Question
A can do a work in 12 days and B in 18 days. Working together, in how many days can they complete it?
- 7.2 days
- 8 days
- 9 days
- 10 days
Correct answer
A — 7.2 days
Explanation (English)
A's 1 day work = 1/12, B's = 1/18. Together = 1/12 + 1/18 = 5/36. Days = 36/5 = 7.2
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