Algebra

In a two-digit number the units’ digit is 7 more than the tens’ digit. The number with digits reversed is three times as large as the sum of the original number and the two digits. Find the number.

asked by Lola
  1. If the number is ab,
    b = a+7
    10b+1 = 3(10a+b + a+b)

    81 = 3(18 + 9)

    posted by Steve
  2. u = t + 7

    10u + t = 3(10t + u + t + u)
    ... = 33t + 6u

    4u = 32t

    solve the system by substitution or elimination

    posted by Scott

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    This is an SAT question of the day that I can't understand. The sum of the digits of a three-digit number is 12. If the hundreds digit is 3 times the tens digit and the tens digit is 1 over 2 the units digit, what is the tens
  2. math

    This is an SAT Question of the Day. The sum of the digits of a three-digit number is 12. If the hundreds digit is 3 times the tens digit and the tens digit is 1 over 2 the units digit, what is the tens digit of the number? The way
  3. Math - Algebra

    What is the linear equation that will represent the second statement in the following problem: "The sum of the digits of a three-digit number is 12. If the hundreds digit is replaced by the tens digit, the tens digit by the units
  4. math

    A three- digit number is eleven times the two-digit formed by using the hundreds and the units digit of the three - digit number respectively, in the tens and units place of the two - digit number. If the difference between the
  5. Digit Problems

    If the tens digit of a two-digit number is subtracted from the units digit, the difference is 8. The number with the digits reversed is 10 more than nine times the units digit of the original number. Find the number.
  6. math

    i am a 4 digit number.my thousands didgit is 4 less than my tens digit.my hundreds digit equals the sum of my tens digit and my ones digit.my tens digit is 4 more than my ones digit.my ones digit is 1.what number am i?
  7. maths

    In a tree digit number, the tens digit is thrice the units and the hundred digit its time the unit digit .also the sum of its digit is16 .find the number.
  8. Algebra - Math HW HELP!

    1) It is a five-digit whole number. 2) It is a palindrome. 3) Its tens digit is the cube root of a one-digit number. 4) The product of its hundreds digit and its ones digit is 54. 5) The sum of its hundreds digit and its ones
  9. Camansi National High School

    Math In a 3 digit number the hundreds digit is one half of tens digit while the ones digit is more than the tens digit. If the sum of 3 digit is 11, find the numbers.
  10. Math

    My tens digit is the lowest even number. My hundreds digit is six more than my tens digit and my ones digit is one more than my tens digit. My thousand digit is the second odd number. my ans: 2601
  11. ALgebra...plz help

    If the tens digit of a two-digit number is subtracted from the units digit, the difference is 8. The number with the digits reversed is 10 more than nine times the units digit of the original number. Find the number.

More Similar Questions