Solutions by everydaycalculation.com
1st number: 1 2/10, 2nd number: 1 5/20
1210 - 2520 is -120.
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Related: 24/10-25/20 12/10-50/20 12/20-25/20 12/10-25/40 36/10-25/20 12/10-75/20 12/30-25/20 12/10-25/60 60/10-25/20 12/50-25/20 84/10-25/20 12/70-25/20
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