Question

2. Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in:

Answer 1

X persons can do a work in 12 days
Then 2x persons can do the work in y days

Let’s do this question in proportion method

No.of People. No. of days
X. 12
2x. Y

As no of people increases No of days decreases
Therefore it is inverse proportion

In equation we get.
12x/2x=y days
= 6 days
2x people will take 6 days to complete the full task
X people will take 6 days to complete half the task
Therefore 2x people take 3 days to complete the half of the job