Aptitude - Chain Rule - Discussion
Discussion Forum : Chain Rule - General Questions (Q.No. 1)
1.
3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
Answer: Option
Explanation:
Let the required number of working hours per day be x.
More pumps, Less working hours per day (Indirect Proportion)
Less days, More working hours per day (Indirect Proportion)
| Pumps | 4 | : | 3 |  |
:: 8 : x |
| Days | 1 | : | 2 |
4 x 1 x x = 3 x 2 x 8
 x = |
(3 x 2 x 8) |
| (4) |
x = 12.
Discussion:
69 comments Page 3 of 7.
Nikhilkuruli said:
1 decade ago
@Akhilesh sahu: 27 hours.
Neha said:
1 decade ago
Why are you 16*3 for 1 pump?
Ankita agrawal said:
1 decade ago
Its so simple. Just we need to apply correct logic.
Rajeev Guda said:
1 decade ago
3*8 = 24 hours in 2 day i.e., 12 hours a day with 3 pumps.
How can it be 12 hours with 4 pumps?
How can it be 12 hours with 4 pumps?
Emilia said:
1 decade ago
I like @Mehar's Method. So simple to understand. Thanks.
Arjita said:
1 decade ago
@Math master: I didn't get your first statement.
Celita Lewis said:
1 decade ago
If 3 pumps work for 8 hours than total hours in 1 day is 3 * 8 = 24 hours.
So in 2 days total hours of work is 48 hours.
So for 4 pumps the work distributed is (48 / 4) = 12 hours.
So in 2 days total hours of work is 48 hours.
So for 4 pumps the work distributed is (48 / 4) = 12 hours.
Karm Bodh Yadav said:
1 decade ago
There is simple and understandable style to solve:
3 pumps take 24 hrs total (8 Hrs a day).
If 1 pump will be working then, it will need 8*3 = 24 hrs.
1 pump need 24 Hrs in two day.
1 pump need 24*2 Hrs in one day.
If I contribute 4 pumps then.
48/4 = 12 hrs.
3 pumps take 24 hrs total (8 Hrs a day).
If 1 pump will be working then, it will need 8*3 = 24 hrs.
1 pump need 24 Hrs in two day.
1 pump need 24*2 Hrs in one day.
If I contribute 4 pumps then.
48/4 = 12 hrs.
Deepika said:
1 decade ago
Hey I have one simple way that is ma formula is n*D*H/w = N1*D1*H1/W1.
Where n = no.of men.
d = days.
h = hours.
w = work.
So my opinion is 3*8*2 = 4*1*x.
x = 12.
Where n = no.of men.
d = days.
h = hours.
w = work.
So my opinion is 3*8*2 = 4*1*x.
x = 12.
Sobuz said:
1 decade ago
At First we find the Total_hour to finish the work, that is:
3*8*2 = 48.
So, 4*X*1 = 48.
X = 48/4 = 12.
3*8*2 = 48.
So, 4*X*1 = 48.
X = 48/4 = 12.
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