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December 20, 2014

December 20, 2014

Posted by **katherine** on Monday, September 29, 2008 at 9:44pm.

- algebra -
**drwls**, Monday, September 29, 2008 at 11:08pmLet 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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