there r 2 groups of worker.. skilled n partially skilled. if both group work togather they nid 30 days to finish the job. if partially skilled worker can oni do 2/3 of the skilled worker did in a day. how many days needed if only partially skilled worker is workin to finish the job?+ P- y, k6 R& L3 i" i' h
A.50公仔箱論壇9 c( m4 i/ E( m9 [: I5 V& b8 y
B.60$ A7 ]- b6 I. }5 z! b' f
C.655 i0 u6 M* D6 Z; w. |
D.75 |
發表於 2007-9-11 07:38 PM
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