Math

The sum of 3 consecutive odd natural numbers is 69. Find the prime number out of these numbers.

  1. 👍 1
  2. 👎 1
  3. 👁 857
  1. let the 3 consecutive odds be
    n, n+2, and n+4

    n+n+2+n+4=69
    3n = 63
    n = 21

    They are 21, 23, and 25, with 23 as the prime one

    1. 👍 3
    2. 👎 5
  2. let the 3 consecutive no be
    x,x+2,x+4

    x+x+2+x+4=69
    3x+6=69
    3x=69-6
    x=63/3
    x=21

    The three consecutive no are 21,23,25

    1. 👍 0
    2. 👎 3
  3. Let the numberbe x
    First number x
    Second number x+2
    Third number x+4
    A.T.Q
    X+x+2+x+4=69
    3x+6=69
    3X=69-6
    3X=63
    X=63/3
    X=21

    So three numbers are
    21
    21+2=23
    21+4=25

    So,23is the prime number

    1. 👍 0
    2. 👎 1
  4. Let the first no. be =x
    Let the second no. be =x+2
    Let the third no. be =x+4

    x + x+2 + x+4 = 69
    3x + 6 = 69
    3x = 69 - 6
    3x = 63
    x = 63/3
    x = 21

    First no. = 21
    Second no. = 23
    Third no. =25

    Therefore, 23 is a prime
    number

    1. 👍 0
    2. 👎 1

Respond to this Question

First Name

Your Response

Similar Questions

  1. algebra

    Are the following true or false? 1. The difference of two natural numbers is always a natural number. 2. The sum of two natural numbers is always a natural number. 3. The quotient of two natural numbers is always a natural number.

    asked by Bill on September 7, 2010
  2. maths

    can you replace the stars with figures **** x 3 ______ ***** the whole calculation uses each of the digits 0-9 once and once only the 4 figure number contains three consecutive numbers which are not in order. the third digit is

    asked by john on September 21, 2008
  3. PROBLEM SOLVING IN MATHEMATICS

    there are two prime numbers between 100 and 199 such that the ten digits is a prime number, the ones digit is a prime number and the tens and ones digits taken together are a 2 digit prime number. find the sum of these 2 prime

    asked by alya on October 6, 2011
  4. Math

    We call a natural number "odd looking" if all its digits are odd.How many 4-digit odd looking numbers are there?

    asked by John on January 2, 2014
  5. math

    Can someone help me with prime and composite numbers? Prime numbers are counting numbers that can be divided evenly bt only two numbers:1 and themselves. A prime number can also be described as a counting number with exactly two

    asked by haylo on October 24, 2006
  1. 8th Grade Math

    Write an equation and show all work. The sum of three consecutive odd numbers is 111. What is the smallest of the three numbers? (I don't understand the question >.

    asked by Cassidy on September 22, 2013
  2. math

    The sum of the first n odd number is n^2. The sum of the first 30 odd numbers is A. 60 B. 90 C. 300 D. 900 Thank you for the help in advance =)

    asked by Jena on July 19, 2014
  3. algebra

    Five times the smallest of three consecutive odd integers is ten more than twice the longest. Find the integers. The sum of three integers is one hundred twenty three more than the first number. The second number is two more than

    asked by Selenee on October 3, 2009
  4. math check

    Posted by TchrWill on Thursday, July 14, 2005 at 5:44pm. 2.)The sum of four consecutive odd integers is -336. Set up an equation AND solve for all of the integers. Two ways to approach this. -336/4 = -84 making the 4 consecutive

    asked by angel on July 17, 2005
  5. Math

    The sum of 4 consecutive odd numbers is 296. Write an equation and solve it to find the second highest number.

    asked by Anonymous on April 13, 2016

You can view more similar questions or ask a new question.