10. A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. If they all work together, in how many days will the work finish?
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work done by A and B=1/30
work done by B and C=1/24
work done by C and A=1/20
work done by together =1/30+1/24+1/20(taking LCM of 30,24,20)
=4+5+6/120
=15/120
=1/8
work done by together =1/8
work done in day =8
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