A can do a piece of work in 10 days and B can do the same work in 15 days. If they work together, in how many days will the work be completed? MCQ with Answer and Explanation
A can do a piece of work in 10 days and B can do the same work in 15 days. If they work together, in how many days will the work be completed?
A. 5 days
B. 9 days
C. 8 days
D. 6 days
Answer: Option D
Solution (By JKSSB Mock Tests)
A's 1-day work = 1/10, B's 1-day work = 1/15. Combined 1-day work = 1/10 + 1/15 = 5/30 = 1/6. Therefore, they will complete the work together in 6 days.
A can do a work in 14 days and B in 21 days. They begin together but 3 days before the completion of the work, A leaves. What is the total number of days taken to complete the work?
Explanation:
Total work = LCM(14, 21) = 42 units. Efficiency of A = 3, B = 2. Let total days be x. A works for (x - 3) days and B works for x days. 3(x - 3) + 2x = 42 => 3x - 9 + 2x = 42 => 5x = 51 => x = 51/5 = 10(1/5) days.
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