Solutions by everydaycalculation.com
1st number: 10/20, 2nd number: 1 10/20
1020 - 3020 is -11.
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Related: 10/20-60/20 10/40-30/20 10/20-30/40 30/20-30/20 10/20-90/20 10/60-30/20 10/20-30/60 50/20-30/20 70/20-30/20
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