Solutions by everydaycalculation.com
1st number: 10/20, 2nd number: 2 9/20
1020 - 4920 is -3920.
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Related: 10/20-98/20 10/40-49/20 10/20-49/40 30/20-49/20 10/60-49/20 10/20-49/60 50/20-49/20 70/20-49/20
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