A and B can do a qork in 12days,B and C in 15 days and A and C in 20days if they work together .they will complete the work in how many days
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A and B one day work =1/12
B and C one day work= 1/15
A and C one day work=1/20
all together one day work= 2(A+B+C)=1/12+1/15+1/20
10+8+6/120=24/120
1/5
then
A+B+C one day work =1/10
so ABC together work in 10 days
hope it helps
B and C one day work= 1/15
A and C one day work=1/20
all together one day work= 2(A+B+C)=1/12+1/15+1/20
10+8+6/120=24/120
1/5
then
A+B+C one day work =1/10
so ABC together work in 10 days
hope it helps
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