A and B can do a piece of work in 45 days and 40 days respectively. They began the work together, but A left after some days and B finished the remaining work in 23 days. After how many days did A leave? MCQ with Answer and Explanation
Question
Report Error
Discuss this Question (0)
Practice More Time and Work Questions
Question #1
Report Error
A can complete a work in 17 days and B can complete the same work in 27 days. If they work together, in how many days will the work be completed?
Correct Answer: Option D
Explanation:
Combined rate = 1/17 + 1/27. Time = 1 ÷ combined rate = 10.43 days.
Combined rate = 1/17 + 1/27. Time = 1 ÷ combined rate = 10.43 days.
This question belongs to:
Maths
Time and Work
Question #2
Report Error
19 men can complete a work in 32 days. If 27 men work at the same rate, how many days are required?
Correct Answer: Option B
Explanation:
Total work = 608 man-days. Days = 22.52.
Total work = 608 man-days. Days = 22.52.
This question belongs to:
Maths
Time and Work
Question #3
Report Error
A can do a work in 4 days, B in 5 days and C in 10 days. Find the time taken by A, B and C together to do the work.
Correct Answer: Option A
Explanation:
Total work = LCM(4, 5, 10) = 20 units. Efficiency of A = 5, B = 4, C = 2. Combined efficiency = 5 + 4 + 2 = 11 units/day. Time taken together = 20 / 11 = 1(9/11) days.
Total work = LCM(4, 5, 10) = 20 units. Efficiency of A = 5, B = 4, C = 2. Combined efficiency = 5 + 4 + 2 = 11 units/day. Time taken together = 20 / 11 = 1(9/11) days.
This question belongs to:
Maths
Time and Work
No comments yet. Be the first to start the discussion!