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Discussion :: Percentage

  1. What percentage of numbers from 1 to 70 have squares that end in the digit 1?
    2. A.
    1
    B.
    14
    C.
    20
    D.
    21

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    Answer : Option C

    Explanation :

    Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.

    Number of such numbers = 14.

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