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7th Class Mathematics Simple Equations Question Bank Simple Equations

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

    A)  \[\frac{1}{2}\]                  

    B)         \[\frac{1}{5}\]

    C)  \[\frac{27}{5}\]               

    D)         \[\frac{1}{10}\]  

    Correct Answer: D

    Solution :

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


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