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 4 of 4.
Jeyan said:
1 decade ago
Ya. Right. Even I got so!
Why not we say 39 persons did work in (12*5) hours.
Then what would be 30 persons working for (x*6) hours ?
Why not we say 39 persons did work in (12*5) hours.
Then what would be 30 persons working for (x*6) hours ?
Anila said:
2 decades ago
The equation is 30 x 6 x x = 39 x 5 x 12 not clear to understand.
Please explain it clearly. When I solved this problem I got equation as 39 x 12 x 5 = 30 x x x 6.
How come you got that equation?
Please explain it clearly. When I solved this problem I got equation as 39 x 12 x 5 = 30 x x x 6.
How come you got that equation?
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