Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 1 3/5
1215 - 85 is -45.
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Related: 24/15-8/5 12/15-16/5 12/30-8/5 12/15-8/10 36/15-8/5 12/15-24/5 12/45-8/5 12/15-8/15 60/15-8/5 12/15-40/5 12/75-8/5 12/15-8/25 84/15-8/5 12/15-56/5 12/15-8/35
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