Solutions by everydaycalculation.com
1st number: 1 3/15, 2nd number: 3/12
1815 - 312 is 1920.
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Related: 36/15-3/12 18/15-6/12 18/30-3/12 18/15-3/24 54/15-3/12 18/15-9/12 18/45-3/12 18/15-3/36 90/15-3/12 18/15-15/12 18/75-3/12 18/15-3/60 18/15-21/12 18/15-3/84
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