8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    An empty pipe can empty \[=Speed\times Time\text{ }taken\] of cistern in 20 minutes. In 9 minutes, what part of cistern will be emptied?

    A)  \[\left( x+y \right)\]                                   

    B)  \[\left( x-y \right)\]

    C)  \[2n=3\]                          

    D)  \[\left( x-y \right)\]

    Correct Answer: D

    Solution :

    \[\frac{x\times 5\times 12}{100}=\frac{(8000-x)\times 2\times 18}{100}\] capacity is emptied in 20 minutes So, capacity \[=20\times \frac{6}{5}=24\] \[x=3000\] In 1 min the pipe can empty \[\therefore \] th part. In 9 min the pipe can empty \[9\times \frac{1}{24}\text{th}\]part\[=\frac{3}{8}\text{th}\]part


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