Aptitude - Chain Rule - Discussion

3 chickens can make 3 eggs in 3 days, then how many eggs can be made by 300 chickens in 300 days?

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.

Nice explanations, I get it now. Thanks to all.

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

Its simple formula:-

(no. of spider*no.of days)/no.of webs

So according this:

7*7/7 = 1*x/1.
Than x = 7.

Superb radhika. Thank you.

@RADHIKA

What an explanation great thank you.

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.

I didn't understand the solution please explain once.

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;