Solutions by everydaycalculation.com
1st number: 4 2/3, 2nd number: 1 6/21
143 + 2721 is 12521.
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Related: 28/3+27/21 14/3+54/21 14/6+27/21 14/3+27/42 42/3+27/21 14/3+81/21 14/9+27/21 14/3+27/63 70/3+27/21 14/15+27/21 98/3+27/21 14/21+27/21
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