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16 August, 06:38

The population of district a is three times the average population of the other nine districts in the city. what percent of the city's population lives in district a? any idea?

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  1. 16 August, 06:51
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    Let the average of the other nine cities be x, then the population of the nine districts is 9x. The total population of the city is a + 9x. But a = 3x. Hence, the total population is 3x + 9x = 12x.

    Therefore, the percent of the city's population living in district a is 3x/12x * 100 = 25%
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