Question

Illustration 9:
A contractor decided to complete a job in 30 days for which he employed 20 men in the beginning. After
10 days he realised that the job could not be completed on time. Hence he employed 15 more men and
thus completed the job on time. Find the number of extra days it would have taken to complete the job if
the additional men were not employed.​

Answer 1

Answer:

Step-by-step explanation:

The completed part of work = 25%

The completed work units = 30*20 =600

So 25% of work = 600 units

Total work =2400 units

So to complete the work in time = 40 days to complete the work

Required work units to complete =2400–600

=1800 units.

No of men required to complete 1800 units of work in 40 days = 1800÷40

=45

We have already 30 men. the more men required =45-30=15

Answer 2

Answer:

15 days.

Step-by-step explanation:

No.of man-days required to complete the job = (20)(10) + (20+15)(20) = 900 man-days.

If the additional men were not employed, the number of extra days = (900/20) - 30 = 15 days.