8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer How many coins 1.4 cm in diameter and 0.4 cm thick is to be melted to form, right circular cylinder of height 16 cm and diameter 3.5 cm

    A)  200                             

    B)  150            

    C)  250       

    D)  300

    Correct Answer: C

    Solution :

    (c): no. of corns = \[\frac{\pi {{R}^{2}}H}{\pi {{r}^{2}}h}=\frac{{{(3.5)}^{2}}\times 16}{{{(1.4)}^{2}}\times 0.4}\] \[={{\left( \frac{5}{2} \right)}^{2}}\times 40\] \[=\frac{25}{4}\times 40=250.\]

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