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  • Question
  • The sum of the digits of a two digit number is 10, when the number is reversed, the number increases by 72.Find the number.


  • Options
  • A. 64
  • B. 82
  • C. 19
  • D. 37

  • Correct Answer
  • 19 

    Explanation

    By checking options
    91-19=72

    Or

    Let the number be xy
    So 10x + y = 10 ..... (i)

    When the number is reversed the new number is yx
    So (10y + 10 ) - ( 10x +y ) = 72 ....(ii)

    From Eqs. (i) & (ii)
    x = 1 and y =9
    ?number = 19


  • Number System problems


    Search Results


    • 1. 
      The last digit of the number obtained by multiplying the numbers 41 x 42 x 43 x 44 x 45 x 46 x 47 x 48 x 49 will be?

    • Options
    • A. 0
    • B. 1
    • C. 4
    • D. 5
    • Discuss
    • 2. 3, 7, 15, 27, 63, 127, 255

    • Options
    • A. 7
    • B. 15
    • C. 27
    • D. 63
    • E. 127
    • Discuss
    • 3. 2880, 480, 92, 24, 8, 4, 4

    • Options
    • A. 480
    • B. 92
    • C. 24
    • D. 8
    • E. 4
    • Discuss
    • 4. 10, 26, 74, 218, 654, 1946, 5834

    • Options
    • A. 26
    • B. 74
    • C. 218
    • D. 654
    • E. 1946
    • Discuss
    • 5. 15, 16, 34, 105, 424, 2124, 12756

    • Options
    • A. 16
    • B. 34
    • C. 105
    • D. 424
    • E. 2124
    • Discuss
    • 6. 
      Find the product of place value and face value of 5 in 65231

    • Options
    • A. 28000
    • B. 25000
    • C. 27000
    • D. 26000
    • Discuss
    • 7. 
      The units digit in the product ( 784 x 618 x 917 x 463 ) is

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
    • Discuss
    • 8. 
      If 1x5x01 is divisible by 11, then the value of x is

    • Options
    • A. 6
    • B. 4
    • C. 8
    • D. 9
    • Discuss
    • 9. 
      The pair of numbers which are relatively prime to each other is

    • Options
    • A. (68, 85)
    • B. (65, 91)
    • C. (92, 85)
    • D. (102, 153)
    • Discuss
    • 10. 
      When 121012 is divided by 12, the remainder is

    • Options
    • A. 0
    • B. 2
    • C. 3
    • D. 4
    • Discuss


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