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?
( p1 a& t* t3 X cA.500 n5 ?: x" @8 x+ N( q
B.60tvb now,tvbnow,bttvb. g8 i3 j+ V9 W2 B' v
C.65
: d- f* g/ \ V( Y公仔箱論壇D.75 |
發表於 2007-9-11 07:38 PM
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