Solutions by everydaycalculation.com
1st number: 1 12/18, 2nd number: 1 3/18
3018 - 2118 is 12.
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Related: 60/18-21/18 30/18-42/18 30/36-21/18 30/18-21/36 90/18-21/18 30/18-63/18 30/54-21/18 30/18-21/54 30/90-21/18 30/18-21/90
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