Posted by AMBER on Wednesday, March 28, 2012 at 9:07pm.
a+b+c = 250
c = 10 + (a+b)
b = 2a
rearrange things a bit:
a + b + c = 250
-a - b + c = 10
-2a + b = 0
add the top two to get
2c = 260
c = 130
a+b-130 = -10
a+2a-130 = -10
3a = 120
a = 40
b = 80
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