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 4 of 7.
Shaunak said:
1 decade ago
It's simple direct and inverse ratio theory. You can apply unitary method,but that'll take a hell lot of time.
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?
Cauverypithan said:
1 decade ago
Math master method is wrong if 3 pumps works a day for 16 hour and one pump will 16/3 not 16*3.
Raja said:
1 decade ago
@maher. I am just asking where is the concept of chain rule (indirect propprtion) approach.
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.
Guri said:
1 decade ago
I didn't get how you have solved it. Can you explain me this all step by step?
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.
Shubhank said:
1 decade ago
Can anyone just explain the chain rule with direct and indirect proportion?
Hanumanth said:
1 decade ago
pumps*days*hours=pumps*days*hours.
4*1*x=3*8*2.
x=12.
That's simple
4*1*x=3*8*2.
x=12.
That's simple
Akojenu Felix said:
8 years ago
Maths Master Really Explained It Well. I Need More Of Your Teaching.
(1)
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