Anil alone can do a job in 20 days while Sunil alone can do it in 40 days. Anil starts the job, and after 3 days, Sunil joins him. Again, after a few more days, Bimal joins them and they together finish the job. If Bimal has done 10% of the job, then in how many days was the job done?
Correct Answer: Option: 2
Let the work be of 40 units
Amount of work done by Anil in one day = 40/20=2 units
Amount of work done by Sunil in one day = 20/20=1 units
Bimal does 10% work i.e. 4 units.
Rest 40-4=36 units is done by Anil and Sunil.
Let Anil took x days. Therefore, Sunil took (x-3) days. Therefore,
$2\times x+1\times \left( x-3 \right)=36$
Or x = 13 days.
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