# Aptitude - Chain Rule - Discussion

### Discussion :: Chain Rule - General Questions (Q.No.10)

10.

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

[A]. 1
[B].
 7 2
[C]. 7
[D]. 49

Explanation:

Let the required number days be x.

Less spiders, More days (Indirect Proportion)

Less webs, Less days (Direct Proportion)

 Spiders 1 : 7 :: 7 : x Webs 7 : 1

1 x 7 x x = 7 x 1 x 7

x = 7.

 Pawan Goyal said: (Oct 27, 2010) hw that problem has been solved i don't understand the way it has been solve out...plz tell me the way it has been solved out

 Chanti said: (Jan 4, 2011) I didn't understood how the ratio will be considered. As follows 1*7*x=7*1*7 So please give the brief description.

 Mehar said: (Feb 2, 2011) When ever you found these kind of problems, come from the back. Means if 7spiders 7weds in 7days so, 1 spider work ==(7*7)/7=7; one person work==days*work done/ number of workers;

 Anjani said: (Sep 11, 2011) I didn't understand the solution please explain once.

 Radhika said: (Sep 17, 2011) 7 spiders in 7 days make 7 webs Since 7 webs in 7 days.....1 web in 1 day..dis 1 web is made by 7 spiders. Now, Since 7 spiders have made 1web in a day divide this 1 web into 7 parts 1 each for every spider.. So 1 spider will make 1/7 part of the web in a day. Now, 1/7 th part completes in 1 day so 1/7(1st day) + 1/7(2nd day) + 1/7(3rd day) + 1/7(4th day) + 1/7(5th day) + 1/7(6th day) + 1/7(7th day) = 7/7 = 1 complete web by a spider... Thus it took 7 days which is the answer.

 Prabhu said: (Sep 27, 2011) @RADHIKA What an explanation great thank you.

 Sudheer said: (Oct 5, 2011) Superb radhika. Thank you.

 Deepak Verma said: (Jul 20, 2014) Its simple formula:- (no. of spider*no.of days)/no.of webs So according this: 7*7/7 = 1*x/1. Than x = 7.

 Kasinath @Hyd said: (Sep 4, 2014) 7 Spiders ... 7 Days. => 1 spider =7*7= 49 days--- Eq(1). Remaining one is 7 Webs--- Eq(2). But, question is about 1 web. So, when we Divide Eqn(1) by Eqn(2) we get 1 web. =>1 spider =49 days/7 webs = 7 days/1web =>1 spider 1 web = 7 days

 Kilevu said: (Aug 27, 2016) Nice explanations, I get it now. Thanks to all.

 Anomy said: (Oct 26, 2016) To get 7 then I think it needs to be explained better that each spider is working on their own web. Otherwise, it takes 1 team of 7 spiders 7 days to make 7 webs. If you have less on your team you will make fewer webs or it will take longer to make the same number of webs.

 Anoms said: (Dec 23, 2016) 3 chickens can make 3 eggs in 3 days, then how many eggs can be made by 300 chickens in 300 days?

 Anonymous said: (Feb 2, 2017) 7spiders * 1spider * x days = 7webs * 1web * 7days. Spiders on the Left * days = webs on the right * days. => 7 * 1 * x = 7 * 1 * 7. 7x = 49, 7x/7 = 49/7, x = 7days.

 Mr. Mp said: (Aug 31, 2017) Take this example. 7 girls make 7 cakes in 7 days. so 7 girls complete 1 cake in 1 day. 7 girls complete 2cakes in 2days. 7 girls complete 3 cakes in 3 days. Similarly, 7 girls make 7 cakes in 7 days. Simply can say effort of 7 girls is needed for 1 cake to complete in 1 day as good as saying effort of 1 girl is required for 7 days to make 1 cake.

 Siddu K said: (Sep 14, 2017) @Radhika. Super explanation.

 Mayur said: (Dec 23, 2017) Good explanation @Radhika.

 Bala said: (Apr 19, 2018) Nice explanation @Radhika.

 Vinnu said: (Aug 30, 2018) Nice. Thanks all.

 Mayur said: (Jan 18, 2019) 7 Spiders make 7 Webs in 7 Days. -> eq 1 7 Spiders make 1 Web in 1Day -> eq 2 1 Spider make 1 Web in X=? Days) -> eq3 Multiple Value of Number of Spiders with a number of days from eq 2 and eq3 7*1. = 1*X. X. =. 7*1/1, X. = 7 -----> Ans. Less Spiders -> More Days (Indirect Proportion). Less Webs -> fewer Days (Direct Proportion).

 Sushi said: (Mar 10, 2019) @Radhika. Superb explanation, Thank you.

 Pennanson said: (Apr 7, 2019) The correct Answer is 1.

 Anonymous said: (Aug 30, 2020) @Radhika. You explained it very well. Thanks.