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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?公仔箱論壇& j" L, c/ @5 ~9 X
A.502 u) h( }; w/ \) x# V
B.605.39.217.76- |# N0 z6 e7 U
C.65
8 |+ L1 Z5 L! a: {( ^3 \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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