Subject

    Quantitative Aptitude

    Topic

    Areas & Volumes

    The inner circumference of a circular race track, 14m wide is 440m. Find the radius of the outer circle.

    ক)
    84m
    খ)
    24m
    গ)
    44m
    ঘ)
    54m

    Explanation

    let inner radius be r meters. 2πr=440⇒r=(440×744)=70mradius  of  outer  circle  =(70+14)m\begin{array}{l}2\mathrm{πr}=440\Rightarrow\mathrm r=\left(440\times\frac7{44}\right)=70\mathrm m\\\mathrm{radius}\;\mathrm{of}\;\mathrm{outer}\;\mathrm{circle}\;=\left(70+14\right)\mathrm m\end{array} Therefore, Radius of outer circle = 70 + 14 = 84m

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