A man completes 7 8 of a job in 21 days How many more days will it take him to finish the job if qua...........

Math and Mental Ability Time and work

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%

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Explanation:

Initial units of work = 8 units
Out of which, 7 units are completed in 21 days.
So, the number of days that man takes in completing one unit of work = 21/7 = 3 days
Now, amount of new work = 8 + 50% of 8 = 8 + 4 = 12 units
Work remaining = 12 – 7 = 5 units
So, the time taken by the man to complete the rest of the work = 5 × 3 = 15 days