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In 2015 the populations of City X and City Y were equal. From 2010 to 2015, the population of City X increased by 20% and the population of City Y decreased by 10%. If the population of City X was 120,000 in 2010, what was the population of City Y in 2010? |
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Answer» 60000 Choice A is incorrect. If the population of City Y in 2010 was 60,000, then the population of City Y in 2015 would have been 60,000(0.90) = 54,000, which is not equal to the City X population in 2015 of 144,000. Choice B is incorrect because 90,000(0.90) = 81,000, which is not equal to the City X population in 2015 of 144,000. Choice D is incorrect because 240,000(0.90) = 216,000, which is not equal to the City X population in 2015 of 144,000. |
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