A and B can complete a work in 12 days. B and C can complete the same work in 18 days. C and A can complete in 24 days. How many days will take for A, B and C combined together to complete the same amount of work?
1/a+1/b = 1/12
1/b+1/c = 1/18
1/c+1/a = 1/24
2(1/a+1/b+1/c) = (6+4+3)/72
or 1/a+1/b+1/c = 13/(2*72)
or A , B and C together can finish in 144/13 or 11.1 days.
P is able to do a piece of work in 15 days and Q can do the same work in 10 days. If they can work together for 2 days, what is the fraction of work left?
If 15 men take 21 days of 8 hours each to do a piece of work. How many days of 6 hours each would 21 women take, if 3 women do as much work as 2 men?
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