Question

4. A contractor undertakes to dig a canal,
6 kilometre long, in 35 days and employed
90 men. He finds that after 20 days only 2 km
of canal have been dug. How many more men
must he employ to finish the work in time?(arrow method)​

Answer 1

Answer:

ANSWER

Total time given =35 days.

To dig a canal of 2 km in 20 days, 90 men were required.

So, to dig a canal of 1 km in 1 day,

2

90×20

men will be required.

So, to dig a canal of 4 km in 15 days

15

900×4

=240 men will be required.

As 90 men were already employed, so 150 more men are required.