Question 828411
Mary needed different colored balloons for decoration. She had $1.25 and
spent it all on a number of white, red, and blue balloons. 
A white balloon costs $.10, a red one $.15 and a blue one $.05. 
She bought one white balloon less than the red 
and the total number of white and red balloons equals the number
of blue ones. 
How many of each color did Mary buy?
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Equations:
Value Eq:: 10w + 15r + 5b = 125 cents
Quantity::  w  - r   + 0  = -1
Quantity::  w  + r   - b  =  0
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I used a matrix function on my calculator to get:
w = 3 (# of white)
r = 4 (# of red)
b = 7 (# of blue)
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Cheers,
Stan H.