A,B,C can do a piece of work in 12,15and 20days respectively. How long will they take to do it working together.
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Answer:
5 days.
Explanation:
A=1/12 work in 1 day.
B=1/15 work in 1 day.
C=1/20 work in 1 day.
Therefore,
=(1/12)+(1/15)+(1/20)
=(5+4+3)/60 [ LCM of 12,15,20 is 60 ]
=12/60
= 5 days.
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