algebra

Twice the first number is eleven more than the sum of the other two numbers. The sum of twice the first number and three times the third number is one more than the second number. The second number is equal to the sum of the first number and the third number. Find the three numbers.

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asked by nelly
  1. let the numbers be x, y, z
    2x=y+z+11
    2x-y-z=11
    2x+3z=y+1
    2x-y+3z=1
    y=x+z
    -x+y-z=0
    2x-y-z=11-------------- 1
    2x-y+3z =1--------------2
    -x+y-z= 0-------------- 3

    consider equation 1 &2
    Multiply 1 by -1
    Multiply 2 by 1
    we get
    -2x+y+z =-11
    2x-y+3z =1




    Add the two
    4z=-10 -------------4
    z==-2.5
    consider equation 2 & 3
    Multiply 2 by 1
    Multiply 3 by 1
    we get
    2x-y+3z =1
    -x+y+-z =0
    Add the two
    1x+2z= 1-------------5
    plug value of z
    x-5=1
    x=6
    plug value of x & z in 1
    12-y+2.5=11
    y=3.5

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    posted by annie
  2. One-thirdthird of a number is 11 more than ​one-fourthfourth of the same number.
    What is the​ number?

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