solve in detail plz......
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work done by A in 1 day = 1/12
work done by B in 1 day = 1/15
work done by C in 1 day = 1/20
work done by A+B+C in 1 day = 1/12 + 1/15 + 1/20
= 5+4+3)/60
= 12/60
= 1/5
1/5 th work done in 1 day
So total work done in 5 days
work done by B in 1 day = 1/15
work done by C in 1 day = 1/20
work done by A+B+C in 1 day = 1/12 + 1/15 + 1/20
= 5+4+3)/60
= 12/60
= 1/5
1/5 th work done in 1 day
So total work done in 5 days
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