math

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i am a number less than 10.my hundreds digit is 3 more than my thousands digit,my tenths is 2 less than my hundreds and my ones is the sum of my tenths and hundreds digits.what number can i be?

  • math -

    n = your number

    a = ones digit

    b = tenths digin

    c = hundreds digit

    d = thousands digit


    n = a + b / 10 + c / 100 + d / 1000


    c = d + 3

    b = c - 2 = d + 3 - 2 = d + 1

    a = b + c = d + 1 + d + 3 = 2 d + 4


    n = a + b / 10 + c / 100 + d / 1000

    n = 2 d + 4 + ( d + 1 ) / 10 + ( d + 3 ) / 100 + d / 1000 Multiply both sides by 1000


    1000 n = 1000 * ( 2 d + 4 ) + 1000 * ( d + 1 ) / 10 + 1000 * ( d + 3 ) / 100 + 1000 * d / 1000

    1000 n = 1000 * ( 2 d + 4 ) + 100 * ( d + 1 ) + 10 * ( d + 3 ) + d

    1000 n = 2000 d + 4000 + 100 d + 100 + 10 d + 30 + d

    1000 n = 2111 d + 4130


    For d = 0

    1000 n = 2111 * 0 + 4130

    1000 n = 0 + 4130 = 4130 Divide both sides by 1000

    n = 4.130


    For d = 1

    1000 n = 2111 * 1 + 4130

    1000 n = 2111 + 4130 = 6241 Divide both sides by 1000

    n = 6.241


    For d = 2

    1000 n = 2111 * 2 + 4130

    1000 n = 4222 + 4130 = 8352 Divide both sides by 1000

    n = 8.352


    For d = 3

    1000 n = 2111 * 3 + 4130

    1000 n = 6333 + 4130 = 10463 Divide both sides by 1000

    n = 10.463

    A number must be less than 10 , so that is not solution.

    For d = 3 , 4 , 5 ... n > 10


    The solutions are :

    n = 4.130

    n = 6.241

    n = 8.352

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