Practice Test Discussion

Q)

City A has a population of 136000 which is decreasing at the rate of 2400 per year. City B has a population of 84000 which is increasing at the rate of 1600 per year. In how many years, will the population of two cities become equal?

    • Explanation

    let the population of cities A and B become equal after 'x' year

    According to the question

    Population of city A= population of city B

    then,

    = 136000-2400x= 84000+1600x

    = (-1600-2400x)= 84000-136000

    = x=524=13 year

    Hence, Option C is correct.

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