Solutions by everydaycalculation.com
17 - 18 is 156.
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Related: 2/7-1/8 1/7-2/8 1/14-1/8 1/7-1/16 3/7-1/8 1/7-3/8 1/21-1/8 1/7-1/24 5/7-1/8 1/7-5/8 1/35-1/8 1/7-1/40 1/7-7/8 1/49-1/8 1/7-1/56
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