A company has two models of computers, model X and model Y. Operating at a constant rate, a model X computer can complete a certain task in 60 minutes and a model Y computer can complete the same task in 30 minutes. If the company used the same number of each model of computer to complete the task in 1 minute, how many model X computers were used?  Select
A) 18 B) 16 C) 15 D) 17 E) 20
Let's say 1 work is processing 60 gb of data.   Model X : 1 gb per min   Model Y : 2 gb per min   Working together, 1 X and 1 Y = 3 gb per min   So, 20 times as many computers would work at 60 gb per min.   So no. of X =20   Answer is 20
<result>E</result>
A company has two models of computers, model X and model Y. Operating at a constant rate, a model X computer can complete a certain task in 60 minutes and a model Y computer can complete the same task in 30 minutes. If the company used the same number of each model of computer to complete the task in 1 minute, how many model X computers were used?