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  #11  
Old Tuesday, September 15, 2015
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Originally Posted by Adil Ashfaq View Post
1 Man = 2 Boys

Total Boy-days required to complete the task = 6 boys x 20 days = 120 Boy-days
120 days are required by one boy to complete the task.

Now come to the 'then' part.

because
6 men = 12 boys

therefore,

6 men + 8 boys = 12 boys + 8 boys = 20 boys

Now days required to complete the task = 120 boy-days /20 boys = 6 days


120 days are required by one boy to complete the task so the days required by 20 boys will be 120/20 = 6 days.

You can also solve by pursuing with the men instead of boys, i.e. 1 man = 2 boys.
How come we can assume 6 men are equal to 12 boys ? And the question says that 6 men and 8 boys shall take how many days and it's not asking just about boys. It's asking about men as well i.e., I mean 6 mean and 8 boys in the last part of the question.
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@Adil

Kindly guide me bro. It's urgent.

Thanks in anticipation.
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  #13  
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Quote:
Originally Posted by RMKamran View Post
How come we can assume 6 men are equal to 12 boys ? And the question says that 6 men and 8 boys shall take how many days and it's not asking just about boys. It's asking about men as well i.e., I mean 6 mean and 8 boys in the last part of the question.
To accomplish the same task, boys take twofold duration of time when compared with men. In other words the work of 2 boys can be done by a single man.

As the first part shows, work can be done by 3 men OR 6 boys

3 men = 6 boys
Therefore 1 man = 2 boys

To solve the question you have to take 1 group, either men or boys.

6 men = 12 boys

or you can equate 8 boys with 4 men.

120 days are required by 1 boy to complete the task, i.e. 6x20=120
Or you can say
3 x 20 = 60 days are required by a single man for the task

6 men + 8 boys = 6 men + 4 men = 10 men

Time required by 1 man = 60 days
Time required by 10 men = 60/10 = 6 days
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  #14  
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Quote:
Originally Posted by Adil Ashfaq View Post
To accomplish the same task, boys take twofold duration of time when compared with men. In other words the work of 2 boys can be done by a single man.

As the first part shows, work can be done by 3 men OR 6 boys

3 men = 6 boys
Therefore 1 man = 2 boys

To solve the question you have to take 1 group, either men or boys.

6 men = 12 boys

or you can equate 8 boys with 4 men.

120 days are required by 1 boy to complete the task, i.e. 6x20=120
Or you can say
3 x 20 = 60 days are required by a single man for the task

6 men + 8 boys = 6 men + 4 men = 10 men

Time required by 1 man = 60 days
Time required by 10 men = 60/10 = 6 days
Thanks a lot for your detailed reply bro. Jazak'ALLAH Khairan.

I got it. But, let's suppose if there were "5 men or 11 boys" I mean if the figure is in odd number, then how do we solve the question ?

Plus, is there any method to check our answer ? I mean any short method ? Actually, I am bit confused as other two members have solved the same question with different method.

Stay blessed.
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Quote:
Originally Posted by RMKamran View Post
Thanks a lot for your detailed reply bro. Jazak'ALLAH Khairan.


I got it. But, let's suppose if there were "5 men or 11 boys" I mean if the figure is in odd number, then how do we solve the question ?

Plus, is there any method to check our answer ? I mean any short method ? Actually, I am bit confused as other two members have solved the same question with different method.

Stay blessed.
Mention not
If there were odd numbers, you could have gone with the same method, i.e. 5 men = 11boys
The work done by one man would be equal to work done by 2.2 boys. 11÷5 = 2.2 boys = 1 man

You can verify your answer by calculating total time required to complete the task by a single boy or man, not sure about other ways.
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Quote:
Originally Posted by RMKamran View Post
Actually, I am bit confused as other two members have solved the same question with different method.

Stay blessed.

They have solved with the same technique but with a lesser elaboration.
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Originally Posted by exclusively View Post
Pipe A can fill a tank in 3minutes, whereas b can fill it in 4minites. How long would it take both pipes working together to fill it?

What is logic of inverse in ans? can one one plz explain it?

Thanks in anticipation

Pipe A:

1/3 = 1 tank/ 3 mins

Pipe B:

1/4 = 1 tank/ 4 mins

Time taken by A and B by working together = 1/3 + 1/4 =1/x


1/3 + 1/4 = 1/x

7/12 = 1/x

7= 12/x

x= 12/7

x= 1.7143

So, time taken by both pipes working together to fill the tank is 1.7143 mins or 1 min and 43 seconds.
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Old Tuesday, September 15, 2015
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From where are you guys preparing/practicing?
And under what heading these questions come?
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Under Intellegence test ..
You can find these word problems in HCC level books i-e 8th class
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From where are you guys preparing/practicing?
And under what heading these questions come?
Aoa,

I took that work question from Jehangir aptitude test book. But, that is 2005 edition. You can also practice these and other questions included in CSS-general ability subject from GAT and Caravan aptitude book by Ch. Ahmed Najib. HCC level books are also good to practice but those are not enough.

Stay blessed.
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