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- Chain Rule
26.
A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, then the number of revolutions made by the larger wheel is:
- A.4
- C.12
- B.9
- D.49
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Let the required number of revolutions made by larger wheel be x. | ||||||||||
Then, More cogs, Less revolutions (Indirect Proportion) |
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27.
The cost of 16 packets of salt, each weighing 900 grams is Rs. 28. What will be the cost of 27 packets, if each packet weighs 1 kg?
- A.Rs. 52.50
- C.Rs. 58.50
- B.Rs. 56
- D.Rs. 64.75
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Let the required cost be Rs. x. Then, | |||||||||||
| More packets, More cost (Direct Proportion) | |||||||||||
| More weight, More cost (Direct Proportion) | |||||||||||
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28.
10 men, working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the same work in 12 days?
- A.6
- C.12
- B.10
- D.15
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Let the required number of hours per day be x. | |||||||||
| More men, Less hours per day (Indirect Proportion) | |||||||||
| Less days, more hours per day (Indirect Proportion) | |||||||||
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29.
On a scale of map, 0.6 cm represents 6.6 km. If the distance between the points on the map is 80.5 cm, the actual distance between these points is:
- A.9 km
- C.190.75 km
- B.72.5 km
- D.885.5 km
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Let the actual distnace be x km. Then, | |||||||||
| More distance on the map, More is the actual distance (Direct Proportion) | |||||||||
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30.
4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat-weavers in 8 days?
- A.4
- C.12
- B.8
- D.16
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Let the required number of mats be x. | |||||||||
| More weavers, More mats (Direct Proportion) | |||||||||
| More weavers, More mats (Direct Proportion) | |||||||||
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