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Banking Sample Paper RRB Assistant (PT) Sample Test Paper-1

  • question_answer
    The population of vultures in a particular locality decreases at a certain rate (compounded annually). If the current population of vultures is 69120 and the ratio of decreased population for the second year to the third year is 5 : 4, then what was the population of vultures 3 years ago?

    A)  96580

    B)  90850

    C)  118600

    D)  135000

    E)  None of these

    Correct Answer: D

    Solution :

    One year ago \[po{{p}^{n}}=69120\left( \frac{5}{4} \right)\] Two years ago\[po{{p}^{n}}=69120\left( \frac{5}{4} \right)\left( \frac{5}{4} \right)\] Three years ago\[po{{p}^{n}}=69120\left( \frac{5}{4} \right)\left( \frac{5}{4} \right)\left( \frac{5}{4} \right)\] \[=135000\]


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