Question

a job has to be completed by 12 boys in 15 days, if three boys are absent from the first day, then by what percentage should be the remaining boys increase their rate of working to complete the job

Answer 1

if the work completed by a boy then time required= 12*15=180 days.
since 3 boys absent from the first day of work
so no of boy is 9. required days to finish the whole work= 180/9=20 by each boy.
rate of working increased by each boy= 20-15/15*100=33+1/3%.