Solutions by everydaycalculation.com
1st number: 18/20, 2nd number: 1 5/20
1820 - 2520 is -720.
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Related: 36/20-25/20 18/20-50/20 18/40-25/20 18/20-25/40 54/20-25/20 18/20-75/20 18/60-25/20 18/20-25/60 90/20-25/20
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