Mathematics, 02.08.2019 06:20 1315055427
Hotel management: the airgle ag800 can purify the air in a conference hall in 20 fewer minutes than it takes the airgle ag950 to do the same job. together, the two machines can purify the air in the conference hall in 10.5 min. how long would it take each machine, working alone, to purify the air in the room?
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Hotel management: the airgle ag800 can purify the air in a conference hall in 20 fewer minutes than...
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