2011-09-09, 12:26 AM
X + Y = 101 -- (1)
X - Y = 100 -- (2)
(1) - (2),
2Y = 1
Y = 0.5
Therefore, the cork costs $0.50.
X - Y = 100 -- (2)
(1) - (2),
2Y = 1
Y = 0.5
Therefore, the cork costs $0.50.

