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8th Class Mathematics Sample Paper Mathematics Sample Paper - 5

  • question_answer
                In a two digit number, digit in units place is twice the digit in tens place. If 27 is added to it, the digits are reversed. Find the number.

    Answer:

    Let the tens place digit be x then the unit place digit \[=2x\]
    Hence, two digit number \[=10x+2x\]
    = 12x             
    According to condition,          
    \[12x+27=10\times 2x+x\]                                                   
    \[12x+27=20x+x\]
    \[21x12x=27\]
    \[9x=27\]
    x = 3
    Hence, two digit number \[=12x=12\times 3\]
    = 36
                           


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