Solutions by everydaycalculation.com
1st number: 18/21, 2nd number: 1 4/21
1821 + 2521 is 4321.
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Related: 36/21+25/21 18/21+50/21 18/42+25/21 18/21+25/42 54/21+25/21 18/21+75/21 18/63+25/21 18/21+25/63 90/21+25/21
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