9.) A, B and C finish a work in 15 days, 20 days and 25 days: If all the three work for a day each in turn, then on which day the work will be completed? (A) 19th day (B) 18th day (C) 15th day (D) 10th day
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A's 1 day's work = 115
B's 1 day's work = 120
C's 1 day's work = 125
A, B and C worked together.
Therefore, (A+B+C)'s 1 day's work
= 115+120+125
= 20+15+12300=47300
Days taken to complete work by A, B and C working together
= 30047
Therefore, Share of C = 125×30047×4700 = Rs.1200
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