Solutions by everydaycalculation.com
1st number: 1 9/21, 2nd number: 18/21
3021 - 1821 is 47.
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Related: 60/21-18/21 30/21-36/21 30/42-18/21 30/21-18/42 90/21-18/21 30/21-54/21 30/63-18/21 30/21-18/63 30/21-90/21
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