Solutions by everydaycalculation.com
15 - 18 is 340.
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Related: 2/5-1/8 1/5-2/8 1/10-1/8 1/5-1/16 3/5-1/8 1/5-3/8 1/15-1/8 1/5-1/24 1/5-5/8 1/25-1/8 1/5-1/40 7/5-1/8 1/5-7/8 1/35-1/8 1/5-1/56
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