Mathematics, 05.05.2020 18:59 andria89

Two years ago there were 20 trailer homes on Elm Street with an average age of 18 years. At that time, a group of brand new trailer homes was then added to Elm Street. Today, the average age of all the trailer homes on Elm Street is 14 years. How many new trailer homes were added two years ago?

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Two years ago there were 20 trailer homes on Elm Street with an average age of 18 years. At that tim...