Posted by katherine on Monday, September 29, 2008 at 9:44pm.
Let X be the number of calories in a banana, and Y be the number in an orange.
7X = 9Y
7X - 9Y = 0
X - Y = 20
9X - 9Y = 180
2X = 180
X = 90
Y = X -20 = 70
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