some boys do a job in 9days but 5 of them were absent and remaining boys did the the work in 12 days the orignal number of boys was
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lets assume there were x number of boys
as per question,
x boys do a job in 9 days
1 boy does the job in 9x days
(x-5) boys do the job in 9x/(x-5) days
as per question,
9x/(x-5)=12
or,12x-60=9x
or,3x=60
or,x=20
as per question,
x boys do a job in 9 days
1 boy does the job in 9x days
(x-5) boys do the job in 9x/(x-5) days
as per question,
9x/(x-5)=12
or,12x-60=9x
or,3x=60
or,x=20
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