Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 1 19/21
1821 + 4021 is 5821.
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Related: 36/21+40/21 18/21+80/21 18/42+40/21 18/21+40/42 54/21+40/21 18/63+40/21 18/21+40/63 90/21+40/21
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