twelve men can complete a work in 8 days three after..., Time & Work, General Mathematics

Question:Twelve men can complete a work  in 8 days. Three days after they started the work, 3 more men joined. In how many days will all of them together complete the remaining work ?

A 2 
B 4 
C 5 
D 6

/47

+ AnswerB

+ Explanationsolution:
`1` man's 1 day's work `= 1/96`.
`12` men's 3 day's work `= (1/8 xx 3)`
                                    `=  3/8`.
Remaining work `= (1 - 3/8)`
                          `= 5/8`.
`15` men's 1 day's work `= 15/96`.
Now, `15/96` work is done by them in 1 day
`:. 5/8` work is done by them in `(96/15 xx 5/8)`
                                                    `= 4` days.

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