A alone can do a work in 30 days, B alone in 40 days. They start together, but A leaves 5 days before the completion. Total work is completed in 18 days. In how many days did A work?
13 days
The whole work took 18 days, and A left 5 days before the work was completed.
So A worked for 18 – 5 = 13 days, and B worked for all 18 days.
Hence, 13 days.
Similar Questions
A and B can complete a piece of work in 12 days and 18 days, respectively. A begins to do the work and they work alternately, one at a time, for one day each. The whole work will be completed in ________.
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A can do three-seventh of a work in 15 days and B can do two-fifth of the same work in 14 days. If A and B work together, then how long (in days) will they take to complete the work?
If 45 men can build a wall of 360 m length in 18 days, then how many men are required to build the same wall of 180 m length in 15 days?
By working 12 hours a day, 90 people can complete a work in 16 days. How much work will be left after 24 days if 70 people work for 8 hours per day?
15 men can complete a work in 15 days, whereas it takes 18 women to complete the work in 15 days. In how many days will 20 men and 9 women, together, complete the work? (Rounded off to complete number of days.)
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Important Questions from Work Efficiency
Five men and 2 boys can do in 30 days as much work as 7 men and 10 boys can do in 15 days. How many boys should join 40 men to do the same work in 4 days?
A man completes 7/8 of a job in 21 days. How many more days will it take him to finish the job if quantum of work further increased by 50%?
24 men and 12 women can do a piece of work in 30 days. In how many days can 12 men and 24 women do the same piece of work?
A and B together can do a piece of work in 4 days, B and C can do it in 6 days, A and C can do it in 8 days. Then A, B and C together can do the same work in :-
A can complete 50% of a work in 9 days and B can do 25% of the work in 9 days, if they work alone. If they work together then how much work (in percentage) can be completed in 6 days?
