Posted by Jennifer on Monday, November 5, 2012 at 11:36pm.
C = 9/20 - 1/5
to get a common denominator multiply 1/5 by 4/4
C = 9/20 - 4*(1/5) = 9/20 - 4/20 = 5/20 = 1/4
c=1/4
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