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%?
15
Given;
Time taken to complete 7/8 of a job = 21 days
Quantum of work further increased by 50%
Calculation:
Time required to complete the job = \(\frac {21}{7/8} \) = 24 days
So time taken by the man to complete 50% work, t 1= 24/2 = 12 days
Also, remaining work after 21 days = 1 - 7/8 = 1/8 and
time required to complete 1/8 of the job, t 2= Time required to complete whole work - time taken to complete 7/8 of the job i.e.
= 24 - 21 = 3 days
Now the number of days required = t 1 + t 2
= 12 + 3 = 15days
Hence, option 4 is correct.
Important Questions from Work Efficiency
Sumi can complete a job working 5 hours per day in 2 days. If she doubles her working hours per day, then in how many days will she complete the work?
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?
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?
3 men working 7 hours a day can complete a piece of work in 45 days. In how many days will 9 men working 6 hours a day complete the same 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 :-
