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Question 2

Find the least number whose last digit is 7 and which become 5 times larger when this last is carried to the beginning of the number.

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  1. Rakesh Jha
    Rakesh Jha 5 Oct 2021

    Let the number be (…….xyz7)
    since we know that,
    5(……xyz7) = 7 ………xyz
    from left hand side we get z=5 that is on unit place.
    we will place this back in the equation so we get,
    5(……xy57) = 7 ………xy5
    continuing like this we get y=8
    and the final answer is 142857

  3. Ritesh 12 Oct 2021

    Wow.
    Nice question and nice explanation.

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