Çözüldü Algebraic Approach to Percentage Problems

Konusu 'Hareket, Hız, Yüzde, Faiz, Sayısal Yetenek Problemleri ve Genel Kavramlar' forumundadır ve Honore tarafından 23 Haziran 2026 16:38 başlatılmıştır.

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  1. Honore

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    In two successive years, the population of a town has increased by 15% and 20%. What percent of the population has increased after two years?

    A) 32%
    B) 35%
    C) 38%
    D) 68%


    The initial population of the town: x
    x + x·(15 / 100) + [ x + x·(15 / 100) ]·(20 / 100) =
    x + 15x / 100 + 20x / 100 + [ x·(15 / 100) ]·(1 / 5) =
    x + 35x / 100 + 3x / 100 =
    x + 38x / 100 ===> 38%.

    Another Solution:
    The population has increased by 15% and 20%.
    15% increase changes the population to 115% of the original population.
    For the second increase, multiply the result by 120%.
    (1.15) × (1.20) = 1.38 = 138%
    38 percent of the population has increased after two years.


    https://www.effortlessmath.com/math-topics/free-parapro-math-practice-test/
    (Question 4)

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