Question

Dave can finish a specific amount of work in 18 days and Brian can do the same amount of work in 15 days. Brian worked for 10 days and left the job. How many days will it take Dave to finish the remainder of the work?

Answer 1

Let the total work be 90 units (lcm of 18 and 15)

Efficiency of Dave =90/18 =5 units

Efficiency of Brian= 90/15 =6 units

Brian worked for 10 days therefore 6 x 10 =60 units work is done.

Remaining work = 90-60 =30 units.

Dave would take 30/5 =6 days to complete to remaining work.

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