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数学题(英文)

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?
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B.60' r* U6 O* r$ P
C.65公仔箱論壇( y( A+ N1 O* S8 x5 k$ g6 u
D.75
answer is D:75
answer is D:75
D FOR DOG

回復 #1 nelston 的帖子

D.75 days
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