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  • Question
  • 476 ** 0 is divisible by both 3 and 11.The non zero digits in the hundred's and ten's places are respectively:


  • Options
  • A. 6 and 2
  • B. 8 and 2
  • C. 6 and 5
  • D. 8 and 5

  • Correct Answer
  • 8 and 5 

    Explanation

    Let the number  be 476ab0 

     

    476ab0 is divisible by 3 

    => 4 + 7 + 6 + a + b + 0 is divisible by 3

    => 17 + a + b is divisible by 3 ------------------------(i)

     

    476ab0 is divisible by 11

    [(4 + 6 + b) -(7 + a + 0)] is 0 or divisible by 11

    => [3 + (b - a)] is 0 or divisible by 11  --------------(ii)

     

    Substitute the values of a and b with the values given in the choices and select the values which satisfies both Equation 1 and Equation 2.

     

    if a=6 and b=2, 

    17 + a + b = 17 + 6 + 2 = 25 which is not divisible by 3 --- Does not meet equation(i).Hence this is not the answer

     

    if a=8 and b=2, 

    17 + a + b = 17 + 8 + 2 = 27 which is divisible by 3 --- Meet equation(i)

    [3 + (b - a)] = [3 + (2 - 8)] = -3 which is neither 0 nor divisible by 11---Does not meet equation(ii).Hence this is not the answer

     

    if a=6 and b=5, 

    17 + a + b = 17 + 6 + 5 = 28 which is not divisible by 3 --- Does not meet equation (i) .Hence this is not the answer

     

     

    if a=8 and b=5, 

    17 + a + b = 17 + 8 + 5 = 30 which is divisible by 3 --- Meet equation 1

    [3 + (b - a)] = [3 + (5 - 8)] = 0 ---Meet equation 2

    Since these values satisfies both equation 1 and equation 2, this is the answer


  • More questions

    • 1. 
      ?. x 2 ? 6x = 7
      ?. 2y 2 + 13y + 15 = 0

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • Discuss
    • 2. 
      If U = {a, b, c, d, e, f}, A = {a, b, c}, find (U ? A)?.

    • Options
    • A. U
    • B. A
    • C. ?
    • D. None of these
    • Discuss
    • 3. 
      Mukul's income is 10% more than Sunil's. How much less is Sunil's income than that of Mukul's?

    • Options
    • A. 8.09 %
    • B. 9.09 %
    • C. 7.09 %
    • D. 7.90 %
    • Discuss
    • 4. 3, 7, 15, 39, 63, 127, 255, 511

    • Options
    • A. 7
    • B. 15
    • C. 39
    • D. 63
    • E. 127
    • Discuss
    • 5. 19, 26, 33, 46, 59, 74, 91

    • Options
    • A. 26
    • B. 33
    • C. 46
    • D. 59
    • E. 74
    • Discuss
    • 6. If the number 481 * 673 is completely divisible by 9, then the smallest whole number in place of * will be:

    • Options
    • A. 2
    • B. 5
    • C. 6
    • D. 7
    • E. None of these
    • Discuss
    • 7. 6, 13, 18, 25, 30, 37, 40

    • Options
    • A. 25
    • B. 30
    • C. 37
    • D. 40
    • Discuss
    • 8. 
      The true discount on a certain bill due for nine months at 4 % simple interest is ?150. Find the amount of the bill.

    • Options
    • A. ?5150
    • B. ?5250
    • C. ?4750
    • D. ?5650
    • Discuss
    • 9. 
      The present worth of $ 220.50 due in 2 years reckoning compound interest at 5 % is :

    • Options
    • A. $ 200
    • B. $ 197.5
    • C. $ 202
    • D. $ 192.25
    • Discuss
    • 10. 
      The value of 12x2y4z3 ÷ (2xy2 × 3yz2) will be :

    • Options
    • A. 2xyz
    • B. xyz
    • C. 1 xyz
    • D. 2 xyz
    • Discuss


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