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…
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 is further increased by 50%?
24
21
18
15
Solution
Let total work be 8 units. He completes 7 units in 21 days, so 1 unit takes 3 days. New total work = $8 + 50\% \text{ of } 8 = 12$ units. Work remaining = $12 - 7 = 5$ units. Time required = $5 \times 3 = 15$ days.