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.
Vishal said:
1 decade ago
3 pumb work in 2 days = 16 hours for empty the tank
1 pump work in 2 days = 16*3 = 48 hours for empty the tank
so 4 pump ...........= (16*3)/4 = 12..
1 pump work in 2 days = 16*3 = 48 hours for empty the tank
so 4 pump ...........= (16*3)/4 = 12..
(1)
Naveen moorthy said:
1 decade ago
As tank are Same.
So 3x8=24 hours required for 1 day for that tank.
So hrs will be same.
For 4 tanks, 4x6=24 for 2 days.
If it 1 day, 6x2=12 hours.
So 3x8=24 hours required for 1 day for that tank.
So hrs will be same.
For 4 tanks, 4x6=24 for 2 days.
If it 1 day, 6x2=12 hours.
Deepesh pathariya said:
1 year ago
3 pumps 8 hours a day empty a tank in 2 days.
Hence 1 pump can empty the tank = 3 * 8 * 2 hours.
= 48 hours.
4 pump can empty the tank = 48/4.
= 12.
Hence 1 pump can empty the tank = 3 * 8 * 2 hours.
= 48 hours.
4 pump can empty the tank = 48/4.
= 12.
(37)
Uttam said:
1 decade ago
@ Math Master
Your approach is good, but it dint use the case that pumps should empty the tank within 1 day, is it doesn't make any difference?
Your approach is good, but it dint use the case that pumps should empty the tank within 1 day, is it doesn't make any difference?
Umesh said:
1 decade ago
Total work (Time to empty the tank by one pump) = 3(pumps)* 8(hours)*2(days)
= 42hours
When 4 pumps are using it will take 42/4= 12 hours
= 42hours
When 4 pumps are using it will take 42/4= 12 hours
Mehar said:
1 decade ago
D P H
2 3 8 ==> Fill the tank
1 4 x ==> Have to do empty same tank ,
so work is same then
2*3*8=1*4*x => x=12.
2 3 8 ==> Fill the tank
1 4 x ==> Have to do empty same tank ,
so work is same then
2*3*8=1*4*x => x=12.
Babar said:
9 years ago
3 pumps working 8 hours.
So total hours = 3 * 8 = 24 * 2 = 48 to fill.
So can empty 48/4 = 12 hours.
Then, the answer = 12.
So total hours = 3 * 8 = 24 * 2 = 48 to fill.
So can empty 48/4 = 12 hours.
Then, the answer = 12.
(2)
Haruthra said:
9 years ago
I got the solution by this method.
3 : 16 = 4 : x.
so,
3/4 = x / 16
4x = 64
x = 12.
Therefore, the answer is 12 hours.
3 : 16 = 4 : x.
so,
3/4 = x / 16
4x = 64
x = 12.
Therefore, the answer is 12 hours.
Hari said:
1 decade ago
Yes it's very easy to understand solved by Mathmaster. ThanQ.
I can't understand your question Mr. Akhilesh sahu.
I can't understand your question Mr. Akhilesh sahu.
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.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers