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7th Class Mathematics Simple Equations Question Bank Linear Equation in one Variable

  • question_answer
    Given\[A=P(1+rt)\], what is the value of 'r' when\[A=27\],\[P=18\] and\[t=5\]?

    A)  \[\frac{11}{23}\]                                  

    B)  \[\frac{2}{9}\]

    C)  \[\frac{27}{7}\]                        

    D)  \[\frac{1}{10}\]

    Correct Answer: D

    Solution :

    (d)\[A=P(1+rt)\] \[\Rightarrow 27=18(1+5r)\] \[\Rightarrow \]\[r=\frac{27-18}{18}\times \frac{1}{5}=\frac{1}{2}\times \frac{1}{5}=\frac{1}{10}\]


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