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- Chain Rule
21.
If a quarter kg pf potato costs 60 paise, how many paise will 200 gm cost?
- A.48 paise
- C.56 paise
- B.54 paise
- D.72 paise
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Let the required cost x paise, Less weight, Less cost (Direct Proportion) | |||||||||
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22.
36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work?
- A.12
- C.22
- E.None of these
- B.18
- D.24
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Let the required number of days be Rs. x. | |||||||||
| Then, Less men, More days (Indirect Proportion) | |||||||||
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23.
3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
- A.9
- C.11
- B.10
- D.12
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Let the required number of working hours per day be x. | |||||||||
| More pumps, Less working hours per day (Indirect Proportion) | |||||||||
| Less days, more working hours per day (Indirect Proportion) | |||||||||
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24.
A certain number of persons can dig a trench 100 m long, 50 m broad and 10 m deep in 10 days. The same number of persons can dig another trench 20 m broad and 15 m deep in 30 days. The length of the second trench is:
- A.400 m
- C.800 m
- B.500 m
- D.900 m
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Let the required length be x metres. | |||||||||||
| More breadth, Less length (Indirect Proportion) | |||||||||||
| More depth, Less length (Indirect Proportion) | |||||||||||
| More days, More length (Direct Proportion) | |||||||||||
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25.
If 9 examiners can examine a certain number of answer books in 12 days, working 5 hours a day; for how many hours a day would 4 examiners have to work in order to examine twice the number of answer books in 30 days?
- A.6
- C.9
- B.8
- D.10
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Let the required number of working hours per day be x. | |||||||||||||||
| Less examiners, More working hours per day (Indirect Proportion) | |||||||||||||||
| More days, Less working hours per day (Indirect Proportion) | |||||||||||||||
| More answer books, More working hours per day (Direct Proportion) | |||||||||||||||
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