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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-13

  • question_answer
    The sum of the digits of a two digit number is 7. The unit digit of the number is equal to the tens digit of the number obtained when it is halved. Tens digit of the number is 1 less than units digit of the number obtained when its halved. What is original number?

    A) 43                               

    B) 52

    C) 61                               

    D) Data are insufficient

    Correct Answer: B

    Solution :

    Let the units digit of a two digit number = x Tens digit \[=7-x\] Two digit number \[=10(7-x)+x\] \[=~70-9x\] other number \[=10x+(7-x+1)\] \[=\,\,\,9x+8\]  \[\therefore \,\,\left( 70-9x \right)\times \frac{1}{2}=9x+8\] \[\Rightarrow \,\,\,x=2\] \[\therefore \] Two digit number \[=70-9\times 2=\] .


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