Aptitude - Chain Rule - Discussion
Discussion Forum : Chain Rule - General Questions (Q.No. 5)
5.
39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?
Answer: Option
Explanation:
Let the required number of days be x.
Less persons, More days (Indirect Proportion)
More working hours per day, Less days (Indirect Proportion)
| Persons | 30 | : | 39 |  |
:: 12 : x |
| Working hours/day | 6 | : | 5 |
30 x 6 x x = 39 x 5 x 12
 x = |
(39 x 5 x 12) |
| (30 x 6) |
x = 13.
Discussion:
32 comments Page 3 of 4.
Nagendra kumbar said:
9 years ago
1st section = 39 P *12 D *5H
2nd section =30 P * X D * 6H
Then ,
39 * 12 * 5 = 30 * X * 6,
X = (39 * 12 * 5)/(30 * 6),
X = 13.
2nd section =30 P * X D * 6H
Then ,
39 * 12 * 5 = 30 * X * 6,
X = (39 * 12 * 5)/(30 * 6),
X = 13.
Nisha said:
1 decade ago
The sum of infinity of a geometric series is 60. If its first term is 80, find the common ratio? can you give the answers?
Aranya said:
1 decade ago
Persons 30 : 39 :: 12 : x.
Working hours/day 6 : 5.
How did we get the following line?
30 x 6 x x = 39 x 5 x 12.
Working hours/day 6 : 5.
How did we get the following line?
30 x 6 x x = 39 x 5 x 12.
Suman said:
9 years ago
If 6 man or 8 woman can repair a road in 28 days. How long 8 man and 2 woman will repair it.
Please solve this.
Please solve this.
Lavanya said:
7 years ago
There is a formula. Here it is a total person(M) * days(D) * hours(H):
M1 * D1 * H1=M2 * D2 * H2.
M1 * D1 * H1=M2 * D2 * H2.
(4)
Lokesh said:
6 years ago
30 x 12 x 5 = 2340.
30 x days x 6 = 2340 (because work is same),
180xdays = 2340,
Days = 13.
30 x days x 6 = 2340 (because work is same),
180xdays = 2340,
Days = 13.
(1)
Nilesh Tripathi said:
9 years ago
@Pratswinz.
You explained it in the best way. Thanks, it's very helpful.
You explained it in the best way. Thanks, it's very helpful.
Buddhika said:
1 decade ago
M1D1H1 = M2D2H2
39*12*5 = 30*D*6.
2340 = 180d.
13 = d.
39*12*5 = 30*D*6.
2340 = 180d.
13 = d.
Nikita said:
6 years ago
Can someone please explain the calculation in detail?
(1)
Appu said:
9 years ago
39*12*5 = 2340.
30*x*6 = 2340.
x = 2340/180 = 13.
30*x*6 = 2340.
x = 2340/180 = 13.
(1)
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