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C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)
  • a)
    20 days
  • b)
    26.4 days
  • c)
    25.6 days
  • d)
    24.8 days
  • e)
    None of the above
Correct answer is option 'E'. Can you explain this answer?
Most Upvoted Answer
C alone can destroy 35% of the piece of work in 21 days. The efficien...
Let’s assume the total work is 720 units.
C alone can destroy 35% of the piece of work in 21 days.
C alone can destroy 100% of the piece of work = 60 days.
Efficiency of C = 720/60 = -12 units/day (Negative sign represents the work is destroying.)
B and C together can complete the same piece of work in 120 days.
Efficiency of B and C together = 720/120 = 6 units/day
Efficiency of B = 6 - (-12) = 6 + 12 = 18 units/day
D alone can do 75% of the same piece of work in 60 days
D alone can do 100% of the same piece of work = 80 days
Efficiency of D = 720/80 = 9 units/day
The efficiency of D is 10% less than the efficiency of A.
9 = 90% of efficiency of A
efficiency of A = 10 units/day
Time taken by A, B, C and D together to complete the same work = 720/ (10 + 18 - 12 + 9)
​= 720/25
= 28.8 days
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Community Answer
C alone can destroy 35% of the piece of work in 21 days. The efficien...
Understanding the problem:
- C can destroy 35% of the work in 21 days.
- Efficiency of D is 10% less than A.
- B and C together can complete the work in 120 days.
- D can complete 75% of the work in 60 days.

Solution:

Step 1: Calculate the efficiencies of A, B, C, and D
- Let the efficiency of A be x.
- Efficiency of D = 0.9x (10% less than A).
- Efficiency of B + C = 1/120 (they can complete the work in 120 days).
- Efficiency of C = 35%/21 = 5/3 (as C can destroy 35% of the work in 21 days).

Step 2: Calculate the efficiency of D
- D can complete 75% of the work in 60 days.
- Efficiency of D = 75%/60 = 5/4.

Step 3: Calculate the efficiency of A, B, C, and D
- A + B + C + D = (1/x) + (1/120) + (5/3) + (5/4).

Step 4: Calculate the time taken by A, B, C, and D together to complete the work
- A + B + C + D can complete the work in 1 day.
- Time taken = 1 / (A + B + C + D).
Therefore, the time taken by A, B, C, and D together to complete the work cannot be directly calculated from the given information.
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C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer?
Question Description
C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer? for Banking Exams 2025 is part of Banking Exams preparation. The Question and answers have been prepared according to the Banking Exams exam syllabus. Information about C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer? covers all topics & solutions for Banking Exams 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer?.
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Here you can find the meaning of C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer?, a detailed solution for C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer? has been provided alongside types of C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice C alone can destroy 35% of the piece of work in 21 days. The efficiency of D is 10% less than the efficiency of A. B and C together can complete the same piece of work in 120 days. If D alone can do 75% of the same piece of work in 60 days, find out the time taken by A, B, C and D together to complete the same work. (Except C none of the people are destroying the work.)a)20 daysb)26.4 daysc)25.6 daysd)24.8 dayse)None of the aboveCorrect answer is option 'E'. Can you explain this answer? tests, examples and also practice Banking Exams tests.
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