9.
A and B together can finish a piece of work in 12 days. If ' A'alone can finish the same
work in 20days, in how many days B alone can finish it?
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9.
A and B together can finish a piece of work in 12 days. If ' A'alone can finish the same
work in 20days, in how many days B alone can finish it?
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Answer:
as we know a person one day work is equal to 1/n of total work where n is number of days
therefore a+b is equal to
Va of the total work+1/b of the total work
=1/12(as we calulate per day)
1/20+1/b of the total work =1/20 (as they gave as
a alone can do in 20 days)
Vb of the total work =1/20-1/12
Vb of the total work =as LCM is 60 we get
3-5/60
Vb of the total work=-2/60-1/30
therefore as b one day work is 1/30 the total
work is equal to 30 days
b works in 30 days or in 1 month