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.
Nikita said:
6 years ago
Can someone please explain the calculation in detail?
(1)
Aayush said:
4 years ago
To solve, we need to have at least two scenarios.
Scenario1 Scenario 2
39 * 12 * 5 = 30 * X * 6,
2340 = 180 * X,
2340 ÷ 180 = X,
13 = X.
Scenario1 Scenario 2
39 * 12 * 5 = 30 * X * 6,
2340 = 180 * X,
2340 ÷ 180 = X,
13 = X.
(4)
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