Question

20 workers can do a work in 30 days. After how many days should 5 workers leave the job so that the task is completed in 35 days

Answer 1

now days req by one worker to comp work = 20*30= 600
than let no. days when 5 workers leaved = x
than 15*35+x = 20*60
x = 5

Answer 2

requirement of days of one worker to complete the work = 20×30 = 600
the no. of workers leave the job = 5 ; let the days be x
then, 15×35 + x = 20×30
595 + x = 600
x = 600-595
x = 5