Solutions by everydaycalculation.com
13 - 27 is 121.
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Related: 2/3-2/7 1/3-4/7 1/6-2/7 1/3-2/14 1/3-6/7 1/9-2/7 1/3-2/21 5/3-2/7 1/3-10/7 1/15-2/7 1/3-2/35 7/3-2/7 1/3-14/7 1/21-2/7 1/3-2/49
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