Solutions by everydaycalculation.com
1st number: 9/20, 2nd number: 2 9/20
920 - 4920 is -21.
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Related: 18/20-49/20 9/20-98/20 9/40-49/20 9/20-49/40 27/20-49/20 9/60-49/20 9/20-49/60 45/20-49/20 63/20-49/20
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