Question 1174994: ann, bella and cindy can do a piece of work in 20,30 and 60 days respectively. ann can do work in 15 days and bella in 20 days. if they work on it together for 4 days,then what is the fraction of work left?
Answer by ikleyn(52806)   (Show Source):
You can put this solution on YOUR website! .
As the problem is worded and presented, it is UNCLEAR from the question, who are that "they", who are mentioned in it.
Those, who write Math problems, MUST avoid such ambiguity.
But, if to assume that "they" are the three taken together, then in 4 days they will make
 =  =  = 
of the job, and, hence,  of the job left. ANSWER
By the way, the second sentence of the condition CONTRADICTS to the first one.
From which TRASH BIN did you recover this "problem" ?
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