If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many da

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Question
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

Correct Answer

7

Explanation

Let the required number days be x.

Less spiders, More days (Indirect Proportion)

Less webs, Less days (Direct Proportion)

$\begin{array}{r} \begin{matrix} S p i d e r s & 1 : 7 \end{matrix} \\ \begin{matrix} W e b s & 7 : 1 \end{matrix} \end{array}\} ? ? 7 : x$

=> 1 * 7 * x = 7 * 1 * 7

=> x= 7

Chain Rule problems

Search Results

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ?
Options
A. 24 days
B. 28 days
C. 34 days
D. 35 days

9. If a quarter kg of carrots costs 60 paise, how many paise will 200 gms cost ?
Options
A. 78 paise
B. 48 paise
C. 54 paise
D. 62 paise

10. The sum of 3rd and 15th elements of an arithmetic progression is equal to the sum of 6th, 11th and 13th elements of the same progression. Then which element of the series should necessarily be equal to zero ?
Options
A. 14th element
B. 9th element
C. 12th element
D. 7th element

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