Solutions by everydaycalculation.com
1st number: 12/15, 2nd number: 2 4/10
1215 - 2410 is -85.
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Related: 24/15-24/10 12/15-48/10 12/30-24/10 12/15-24/20 36/15-24/10 12/15-72/10 12/45-24/10 12/15-24/30 60/15-24/10 12/75-24/10 12/15-24/50 84/15-24/10 12/15-24/70
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