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:
70 comments Page 3 of 7.
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.
Vivek said:
1 decade ago
One pump requires 16 *3 = 48 hrs to empty the tank.
4 pump requires 48/4 = 12 hrs.
4 pump requires 48/4 = 12 hrs.
Lakshmi said:
1 decade ago
3 pumps -> 8h -> 2 days.
4 pumps -> ? -> 1 day.
3*8*2/4*1 = 12.
4 pumps -> ? -> 1 day.
3*8*2/4*1 = 12.
Ankita agrawal said:
1 decade ago
Its so simple. Just we need to apply correct logic.
Neha said:
1 decade ago
Why are you 16*3 for 1 pump?
Nikhilkuruli said:
1 decade ago
@Akhilesh sahu: 27 hours.
Ekta Ravish said:
1 decade ago
Its very much easy to solve question using these pattern.
Smit said:
1 decade ago
I can't understand please explain.
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