Multiple Choice Questions on In a two digit positive number the digit at the units place is equal to the square of the digit in t........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

In a two digit positive number the digit at the units place is equal to the square of the digit in t...........

Quantitative Aptitude ( CCS) Number System
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    In a two digit positive number, the digit at the units place is equal to the square of the digit in ten’s place and the difference between the number and the number obtained by interchanging the digits is 54. What is 40% of the original number?

    15.6

    Correct Answer

    37.2

    Incorrect Answer

    39.4

    Incorrect Answer

    24.8

    Incorrect Answer
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    Explanation:

    Let the number be 10x + y
    And y = x²
    10x + y – (10y + x) = 54
    9x – 9y = 54
    x – y = 6
    x²- x + 6 = 0
    x = 2, 3
    y = 4, 9
    So the no is 39
    39*40/100 = 15.6

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