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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4 Z# p' w/ F* V6 I
A.50
9 @' `. |! n8 S5 n! ytvb now,tvbnow,bttvbB.60
( G! ^- a( q6 j( y: w" E+ x公仔箱論壇C.65
' s1 a0 I2 K( c" }& r/ B0 s# x' I% sTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。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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