Solutions by everydaycalculation.com
13 - 18 is 524.
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Related: 2/3-1/8 1/3-2/8 1/6-1/8 1/3-1/16 1/3-3/8 1/9-1/8 1/3-1/24 5/3-1/8 1/3-5/8 1/15-1/8 1/3-1/40 7/3-1/8 1/3-7/8 1/21-1/8 1/3-1/56
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