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10th Class Mathematics Real Numbers Question Bank MCQs - Real Numbers

  • question_answer
    What will be the least possible number of the planks, if three pieces of timber 42 m, 49 m and 63 m long have to be divided into planks of the same length?          

    A) 5

    B) 6

    C) 7

    D) None of these

    Correct Answer: D

    Solution :

    Sol.      [d] Length of plank = HCF of 42, 49 and \[63=7\]
    \[\therefore \]  Number of planks \[=\frac{42}{7}+\frac{49}{7}+\frac{63}{7}\]
    \[=6+7+9=22\]


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