SOLUTION: The sum of three numbers is 20. The difference of the first two numbers is 5 and the third number is 4 times the sum of the first two

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Question 1074725: The sum of three numbers is 20. The difference of the first two numbers is 5 and the third number is 4 times the sum of the first two
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39630)   (Show Source): You can put this solution on YOUR website!
x, y, z
Assumption made here is .



(corrected)---
Substituting for z,



The system here ready for use of Elimination Method.
ADD:

-
SUBTRACT:

-
Use x and y to find z.




-
(posted earlier - incorrect -
--------------------------------------------------------------------
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From first equation
Substituted into equation #3

-----MISTAKE... All the rest below is wrong...




Simpler system in just x and y
Answer by MathTherapy(10557)   (Show Source): You can put this solution on YOUR website!
The sum of three numbers is 20. The difference of the first two numbers is 5 and the third number is 4 times the sum of the first two
If 1st is larger than 2nd, then 

If 1st is smaller than 2nd, then 

As usual, IGNORE all RIDICULOUS and/or NONSENSICAL answers. 

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