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 6 of 7.
Kjkj tikhir said:
10 years ago
3 pumps = 8 hrs/day.
1 pump = 8*3 = 24 hrs/day and 48 hrs in 2 days.
Considering 1 day work of 3 pumps we know that 24/3 = 8.
Now f we consider 1 day work of 4 pumps should not it be 24/4 = 6.
Please anyone, why? are we considering for two days when it is asked for 1 day work?
1 pump = 8*3 = 24 hrs/day and 48 hrs in 2 days.
Considering 1 day work of 3 pumps we know that 24/3 = 8.
Now f we consider 1 day work of 4 pumps should not it be 24/4 = 6.
Please anyone, why? are we considering for two days when it is asked for 1 day work?
(1)
Smit said:
10 years ago
I can't understand please explain.
Manasi said:
9 years ago
Thanks for solving the problem. It helps always.
Ankit said:
9 years ago
Math master's solution is great.
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.
Sanskriti said:
8 years ago
Working 8 hours a day, 12 people can do a piece of work in 15 days. How many people will complete the same work in 16 days working 9 hours a day?
Please solve the problem.
Please solve the problem.
Suhani said:
8 years ago
8 hours * 12 people * 15 days = work;
Let, x people will complete the work in 16 days so-
9 hours * x people * 16 days = work,
8 * 12 * 15 = 9 * x * 16,
x = 10 people.
Let, x people will complete the work in 16 days so-
9 hours * x people * 16 days = work,
8 * 12 * 15 = 9 * x * 16,
x = 10 people.
Akojenu Felix said:
8 years ago
Maths Master Really Explained It Well. I Need More Of Your Teaching.
(1)
Monika said:
8 years ago
Please solve my problem.
1200 men 500 women can build a bridge in 2 weeks. 900 men and 250 women will take 3 weeks to build the same bridge. How many men will be needed to build the bridge in one week?
1200 men 500 women can build a bridge in 2 weeks. 900 men and 250 women will take 3 weeks to build the same bridge. How many men will be needed to build the bridge in one week?
(6)
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