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The population of Grand Island, Nebraska, grew by 600,000 people between 1995 and 2005, one-fifth more than the town council predicted. The town council originally predicted the city’s population would grow by:

A 500,000

Let x = the original estimate. An additional one-fifth would be 6/(5x), or 120% of x. The equation can be expressed as 1.2x = 600000. To solve for x, divide both sides of the equation by 1.2. x = 500,000.