Solutions by everydaycalculation.com
18 - 19 is 172.
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Related: 2/8-1/9 1/8-2/9 1/16-1/9 1/8-1/18 3/8-1/9 1/8-3/9 1/24-1/9 1/8-1/27 5/8-1/9 1/8-5/9 1/40-1/9 1/8-1/45 7/8-1/9 1/8-7/9 1/56-1/9 1/8-1/63
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