math

posted by .

x has 3 digits. the tens digits is half the hundreds digits. the number is odd.the sum of the digits is 9

  • math -

    Let the tens digit be x. Then the hundreds digit is 2x. The sum of these two digits is 3x, and that has to be less than 9, so x must be less than 3 - that is, the tens digit must be 1 or 2.

    So we might have:

    42U or 21U

    where U is the Units digit.

    The digits add to 9, so it has to be

    423 or 216

    But we are told that the answer is odd, and only one of those is odd...

  • math -

    x + 2x = 3x
    solve this first
    where 3x < 9
    3/3 x < 9/3 divide
    both sides by 3
    1x < or = 3 plug in 3 into the equation.
    3 + 3*2 = 3*3

    3 + 6 = 9

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Word Problem : The number has 3 digits the tens digit is half the hundreds digit the number is odd the sum of the digits is 9
  2. math

    (1)I am thinking of a 5-digit odd number. (2)The sum of all its digits is 20. (3) The digits in the hundreds place and in the tens place are consecutive numbers. When you multiply the digits in the tens and hundreds places, you get …
  3. Math

    You can only use the digits 0-9. I need an odd number that is a multiple of five with no repeated digits. Half the digits are odd and the other half is even. The largest digit in the number is in the tens place (but it is not the largest …
  4. 5th Grade Math

    Not only need answer but need to know how you teach a 5th grader how to solve this problem. You can only use the digits 0-9. I need an odd number that is a multiple of five with no repeated digits. Half the digits are odd and the other …
  5. 5th Grade Math

    Not only need answer but need to know how you teach a 5th grader how to solve this problem. You can only use the digits 0-9. I need an odd number that is a multiple of five with no repeated digits. Half the digits are odd and the other …
  6. math

    A number rounds off to 4000.The digits in the hundreds place is twice the digits in the tens place.The sum of the digits is 12.The number uses only two diffirent digits.find the number.
  7. math

    a number rounds off to 4000.the digits in the hundreds place is twice the digits in the tens place.the sum of the digits is 12.the number uses only two different digits.find the number.
  8. MATH

    What is my number if the hundreds digit is less than the tens digit and less than the ones digit and the hundreds digit is even and the tends digit divided by the hundreds digit is 5 and the product of two of the digits is 6 and it …
  9. Math

    I am a 4-digit even number. I am less than 2500. The digits in my hundreds and the tens place is different. The digits in my hundreds place are less than the digits in the one thousands place. The sum of my last 2-digits equal 9. I …
  10. Math

    a number rounds off to 4000.the digits in the hundreds place is twice the digits in the tens place.the sum of the digits is 12.the number uses only two different digits.find the number

More Similar Questions