"A and B working separately can do a piece of work in 9 and 12 days respectively. If they

Описание к видео "A and B working separately can do a piece of work in 9 and 12 days respectively. If they

"A and B working separately can do a piece of work

in 9 and 12 days respectively. If they work for a day alternately, A

beginning, in how many days, he work will be completed?"

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