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?5 U2 c R/ {& c, J! C: I
A.50公仔箱論壇" F6 S* `& Y. c# Q# Y& M& `: u
B.60
3 V% i6 M- y( ?5.39.217.77:8898C.65
; P( x3 {% g: Q% o/ r7 ]D.75 |
發表於 2007-9-11 07:38 PM
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