Exercise :: Chain Rule - General Questions
- Chain Rule - Important Formulas
- Chain Rule - General Questions
6. | A man completes of a job in 10 days. At this rate, how many more days will it takes him to finish the job? |
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Answer: Option B Explanation:
Let the required number of days be x.
x = 6. |
7. | If a quarter kg of potato costs 60 paise, how many paise will 200 gm cost? |
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Answer: Option A Explanation: Let the required weight be x kg. Less weight, Less cost (Direct Proportion) 250 : 200 :: 60 : x 250 x x = (200 x 60)
x = 48. |
8. | In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk? |
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Answer: Option C Explanation: Let the required number of days be x. Less cows, More days (Indirect Proportion) Less bags, Less days (Direct Proportion)
1 x 40 x x = 40 x 1 x 40 x = 40. |
9. | 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 mad by the larger wheel is: |
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Answer: Option B Explanation: Let the required number of revolutions made by larger wheel be x. Then, More cogs, Less revolutions (Indirect Proportion) 14 : 6 :: 21 : x 14 x x = 6 x 21
x = 9. |
10. | If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days? |
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Answer: Option C Explanation: Let the required number days be x. Less spiders, More days (Indirect Proportion) Less webs, Less days (Direct Proportion)
1 x 7 x x = 7 x 1 x 7 x = 7. |