Solutions by everydaycalculation.com
1st number: 1 6/21, 2nd number: 5/21
2721 + 521 is 3221.
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Related: 54/21+5/21 27/21+10/21 27/42+5/21 27/21+5/42 81/21+5/21 27/21+15/21 27/63+5/21 27/21+5/63 27/21+25/21 27/21+35/21
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