This Article consist of most important ” Chain Rule Questions and Answers ” that are mostly asked in all competitive exams. We collected these questions from the students who appeared in exams. Now try to solve these questions.
Chain Rule Questions and Answers
Question : 1 36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work?
A. 12
B. 18
C. 22
D. 24
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Correct Answer : D
Explanation :
Let the required number of days be x.
Less men, More days (Indirect Proportion)
27 : 36 :: 18 : x 27 x x = 36 x 18
x = 24.
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Question : 2 In a camp, there is a meal for 120 men or 200 children. If 150 children have taken the meal, how many men will be catered to with remaining meal?
A. 20
B. 30
C. 40
D. 50
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Correct Answer : B
Explanation :
There is a meal for 200 children. 150 children have taken the meal.
Remaining meal is to be catered to 50 children.
Now, 200 children 120 men.
50 children = (120/200)/50 = 30 men
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Question : 3 A flagstaff 17.5 m high casts a shadow of length 40.25 m. The height of the building, which casts a shadow of length 28.75 m under similar conditions will be:
A. 10 m
B. 12.5 m
C. 17.5 m
D. 21.25 m
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Correct Answer : B
Explanation :
Let the height of the building x metres.
Less lengthy shadow, Less in the height (Direct Proportion)
40.25 : 28.75 :: 17.5 : x 40.25 x x = 28.75 x 17.5
x = (28.75 x 17.5)/40.25
x = 12.5
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Question : 4 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:
A. 4
B. 9
C. 12
D. 49
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Correct Answer : D
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 = 6 x 21/14
x = 9.
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Question : 5 If a quarter kg of potato costs 60 paise, how many paise will 200 gm cost?
A. 48 paise
B. 54 paise
C. 56 paise
D. 72 paise
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Correct Answer : 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 = (200 x 60)/250
= x = 48.
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