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- Question
A certain number of men can finish a piece of work in 100 days. If there were 10 men less, it would take 10 days more for the work to be finished. How many men were there originally?
Options- A. 75
- B. 82
- C. 100
- D. 110
- Correct Answer
- 110
ExplanationOriginally let there be x men.
Less men, More days (Indirect Proportion)
Therefore, (x-10) : x :: 100 :110
=> (x - 10) * 110 = x * 100 => x= 110
- 1. If 20 men can build a wall 56 meters long in 6 days , what length of a similar wall can be built by 35 men in 3 days?
Options- A. 46
- B. 47
- C. 48
- D. 49 Discuss
- 2. Mishti's birthday is on Thursday 27th April. On what day of the week will be Aradhya's Birthday in the same year, if Aradhya was born on 20th October?
Options- A. Friday
- B. Wednesday
- C. Saturday
- D. Thursday Discuss
- 3. Bobby's birthday is on Monday 5th June. On what day of the week will be Pinky's Birthday in the same year if Pinky was born on 22nd September?
Options- A. Saturday
- B. Wednesday
- C. Friday
- D. Sunday Discuss
- 4. Faiyaz's birthday is on Wednesday 12th April. On what day of the week will be Shray's Birthday in the same year if Shray was born on 2nd October?
Options- A. Monday
- B. Saturday
- C. Wednesday
- D. Sunday Discuss
- 5. If 27th February 2011 was Sunday, then 1st March 2012 will be what day of the week?
Options- A. Thursday
- B. Friday
- C. Sunday
- D. Monday Discuss
- 6. If 36 men can do a piece of work in 25 hours, in how mwny hours will15 men do it?
Options- A. 40
- B. 50
- C. 60
- D. 70 Discuss
- 7. 2 men and 7 boys can do a piece of work in 14 days; 3 men and 8 boys can do the same in 11 days. Then, 8 men and 6 boys can do three times the amount of this work in
Options- A. 18 days
- B. 21 days
- C. 24 days
- D. 30 days Discuss
- 8. If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?
Options- A. 1
- B. 3
- C. 7
- D. 14 Discuss
- 9. A contractor undertakes to do a piece of work in 40 days. He engages 100 men at the begining and 100 more after 35 days and completes the work in stipulated time. If he had not engaged the additional men, how many days behind schedule would it be finished?
Options- A. 3
- B. 5
- C. 6
- D. 9 Discuss
- 10. If 18 bindres bind 900 books in 10 days , How many binders will be required to bind 660 books in 12 days?
Options- A. 22
- B. 14
- C. 13
- D. 11 Discuss
Chain Rule problems
Search Results
Correct Answer: 49
Explanation:
Let the required length be x meters
More men, More length built (Direct proportion)
Less days, Less length built (Direct Proportion)
=> (20 x 6 x X)=(35 x 3 x 56)
=> x = 49
Hence, the required length is 49 m.
Correct Answer: Friday
Correct Answer: Friday
Correct Answer: Monday
Correct Answer: Thursday
Correct Answer: 60
Explanation:
Let the required no of hours be x. Then
Less men , More hours (Indirct Proportion)
Therefore, 15:36 ::25:x
=> (15 x X)=(36 x 25) => x = 60
Hence, 15 men can do it in 60 hours.
Correct Answer: 21 days
Explanation:
(2 x 14) men +(7 x 14) boys = (3 x 11) men + (8 x 11) boys
=>5 men= 10 boys => 1man= 2 boys
Therefore, (2 men+ 7 boys) = (2 x 2 +7) boys = 11 boys
( 8 men + 6 boys) = (8 x 2 +6) boys = 22 boys.
Let the required number of days be x.
More boys , Less days (Indirect proportion)
More work , More days (Direct proportion)
Therefore, (22 * 1 * x) = (11 * 3 * 14)
=> x = 21
Hence, the required number of days = 21
Correct Answer: 7
Explanation:
Let the required number days be x.
Less spiders, More days (Indirect Proportion)
Less webs, Less days (Direct Proportion)
=> 1 * 7 * x = 7 * 1 * 7
=> x= 7
Correct Answer: 5
Explanation:
[(100 x 35) + (200 x 5)]men can finish the work in 1 day
Therefore, 4500 men can finish the work in 1 day. 100 men can finish it in 4500/100= 45 days.
This is 5 days behind Schedule
Correct Answer: 11
Explanation:
Let the required no of binders be X.
Less books , Less binders (Direct Proportion)
More days, Less binders (Indirect proportion)
Therefore, (900 * 12 * x) = (660 * 10 * 18)
=> x = 11
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