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6th Class Mathematics Knowing our Numbers Question Bank Number System

  • question_answer
    Rohit had forgotten his 6 - digit bank account number but only remembered that it was of the form A515A0 and was divisible by 36. What is the value of A?

    A)  4                                

    B)  7

    C)  8                                

    D)  9

    Correct Answer: C

    Solution :

    Divisibility rule of 9 is that the sum of all digits should be divisible by 9. Therefore \[\frac{A+5+1+5+A+O}{9}=\frac{11+2A}{9}\] From here, A should be 8. Therefore, the number is 851, 580, which is also divisible by 4.


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